diff --git a/node-crash-course/package-lock.json b/node-crash-course/package-lock.json
index 1af140c..d019223 100644
--- a/node-crash-course/package-lock.json
+++ b/node-crash-course/package-lock.json
@@ -120,8 +120,8 @@
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-      "integrity": "sha1-+PLIh60Qv2f2NPAFtph/7TF5qsg=",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
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       "dev": true
     },
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@@ -156,15 +156,6 @@
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-      "resolved": "https://registry.npm.taobao.org/ansi-align/download/ansi-align-2.0.0.tgz",
-      "integrity": "sha1-w2rsy6VjuJzrVW82kPCx2eNUf38=",
-      "dev": true,
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@@ -187,9 +178,9 @@
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-      "resolved": "https://registry.npm.taobao.org/anymatch/download/anymatch-3.1.1.tgz",
-      "integrity": "sha1-xV7PAhheJGklk5kxDBc84xIzsUI=",
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.3.tgz",
+      "integrity": "sha512-KMReFUr0B4t+D+OBkjR3KYqvocp2XaSzO55UcB6mgQMd3KbcE+mWTyvVV7D/zsdEbNnV6acZUutkiHQXvTr1Rw==",
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@@ -252,26 +243,11 @@
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-      "resolved": "https://registry.npm.taobao.org/binary-extensions/download/binary-extensions-2.0.0.tgz",
-      "integrity": "sha1-I8DfFPaogHf1+YbA0WfsA8PVU3w=",
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
+      "integrity": "sha512-jDctJ/IVQbZoJykoeHbhXpOlNBqGNcwXJKJog42E5HDPUwQTSdjCHdihjj0DlnheQ7blbT6dHOafNAiS8ooQKA==",
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-      "resolved": "https://registry.npm.taobao.org/boxen/download/boxen-1.3.0.tgz",
-      "integrity": "sha1-VcbDmouljZxhrSLNh3Uy3rZlogs=",
-      "dev": true,
-      "requires": {
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-        "camelcase": "^4.0.0",
-        "chalk": "^2.0.1",
-        "cli-boxes": "^1.0.0",
-        "string-width": "^2.0.0",
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       "resolved": "https://registry.npm.taobao.org/brace-expansion/download/brace-expansion-1.1.11.tgz",
@@ -284,8 +260,8 @@
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-      "resolved": "https://registry.npm.taobao.org/braces/download/braces-3.0.2.tgz",
-      "integrity": "sha1-NFThpGLujVmeI23zNs2epPiv4Qc=",
+      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
+      "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
       "dev": true,
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@@ -297,18 +273,6 @@
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-      "resolved": "https://registry.npm.taobao.org/camelcase/download/camelcase-4.1.0.tgz",
-      "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
-      "dev": true
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-      "resolved": "https://registry.npm.taobao.org/capture-stack-trace/download/capture-stack-trace-1.0.1.tgz",
-      "integrity": "sha1-psC74fOPOqC5Ijjstv9Cw0TUE10=",
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@@ -327,33 +291,21 @@
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-      "integrity": "sha1-yE5bPRjZpNd1WP70ZrG/FrvrNFA=",
+      "version": "3.5.3",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.5.3.tgz",
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       "dev": true,
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-        "anymatch": "~3.1.1",
+        "anymatch": "~3.1.2",
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-        "fsevents": "~2.1.2",
-        "glob-parent": "~5.1.0",
+        "fsevents": "~2.3.2",
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         "normalize-path": "~3.0.0",
-        "readdirp": "~3.3.0"
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-    "ci-info": {
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-      "resolved": "https://registry.npm.taobao.org/ci-info/download/ci-info-1.6.0.tgz",
-      "integrity": "sha1-LKINu5zrMtRSSmgzAzE/AwSx5Jc=",
-      "dev": true
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-      "resolved": "https://registry.npm.taobao.org/cli-boxes/download/cli-boxes-1.0.0.tgz",
-      "integrity": "sha1-T6kXw+WclKAEzWH47lCdplFocUM=",
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@@ -390,20 +342,6 @@
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-      "resolved": "https://registry.npm.taobao.org/configstore/download/configstore-3.1.2.tgz",
-      "integrity": "sha1-xvJd767vJt8S3TNBSwAf6BpUP48=",
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@@ -416,15 +354,6 @@
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-      "resolved": "https://registry.npm.taobao.org/create-error-class/download/create-error-class-3.0.2.tgz",
-      "integrity": "sha1-Br56vvlHo/FKMP1hBnHUAbyot7Y=",
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@@ -446,12 +375,6 @@
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@@ -461,12 +384,6 @@
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@@ -491,21 +408,6 @@
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@@ -1277,34 +1179,6 @@
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@@ -1354,8 +1228,8 @@
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-      "integrity": "sha1-GRmmp8df44ssfHflGYU12prN2kA=",
+      "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
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@@ -1394,9 +1268,9 @@
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-      "integrity": "sha1-TAofs0vGjlQ7S4Kp7Dkr+9qECAU=",
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@@ -1418,12 +1292,6 @@
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@@ -1447,40 +1315,12 @@
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@@ -1531,8 +1371,8 @@
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-      "integrity": "sha1-SMptcvbGo68Aqa1K5odr44ieKwk=",
+      "resolved": "https://registry.npmjs.org/ignore-by-default/-/ignore-by-default-1.0.1.tgz",
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@@ -1545,12 +1385,6 @@
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@@ -1573,12 +1407,6 @@
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@@ -1608,8 +1436,8 @@
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-      "integrity": "sha1-6h9/O4DwZCNug0cPhsCcJU+0Wwk=",
+      "resolved": "https://registry.npmjs.org/is-binary-path/-/is-binary-path-2.1.0.tgz",
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@@ -1621,15 +1449,6 @@
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-    "term-size": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npm.taobao.org/term-size/download/term-size-1.2.0.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fterm-size%2Fdownload%2Fterm-size-1.2.0.tgz",
-      "integrity": "sha1-RYuDiH8oj8Vtb/+/rSYuJmOO+mk=",
-      "dev": true,
-      "requires": {
-        "execa": "^0.7.0"
-      }
-    },
     "text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npm.taobao.org/text-table/download/text-table-0.2.0.tgz",
@@ -2643,12 +2273,6 @@
       "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
       "dev": true
     },
-    "timed-out": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npm.taobao.org/timed-out/download/timed-out-4.0.1.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Ftimed-out%2Fdownload%2Ftimed-out-4.0.1.tgz",
-      "integrity": "sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8=",
-      "dev": true
-    },
     "tmp": {
       "version": "0.0.33",
       "resolved": "https://registry.npm.taobao.org/tmp/download/tmp-0.0.33.tgz",
@@ -2666,8 +2290,8 @@
     },
     "to-regex-range": {
       "version": "5.0.1",
-      "resolved": "https://registry.npm.taobao.org/to-regex-range/download/to-regex-range-5.0.1.tgz",
-      "integrity": "sha1-FkjESq58jZiKMmAY7XL1tN0DkuQ=",
+      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
+      "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
       "dev": true,
       "requires": {
         "is-number": "^7.0.0"
@@ -2675,8 +2299,8 @@
     },
     "touch": {
       "version": "3.1.0",
-      "resolved": "https://registry.npm.taobao.org/touch/download/touch-3.1.0.tgz",
-      "integrity": "sha1-/jZfX3XsntTlaCXgu3bSSrdK+Ds=",
+      "resolved": "https://registry.npmjs.org/touch/-/touch-3.1.0.tgz",
+      "integrity": "sha512-WBx8Uy5TLtOSRtIq+M03/sKDrXCLHxwDcquSP2c43Le03/9serjQBIztjRz6FkJez9D/hleyAXTBGLwwZUw9lA==",
       "dev": true,
       "requires": {
         "nopt": "~1.0.10"
@@ -2708,39 +2332,6 @@
       "integrity": "sha512-WxONCrssBM8TSPRqN5EmsjVrsv4A8X12J4ArBiiayv3DyyG3ZlIg6yysuuSYdZsVz3TKcTg2fd//Ujd4CHV1iA==",
       "dev": true
     },
-    "unique-string": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npm.taobao.org/unique-string/download/unique-string-1.0.0.tgz",
-      "integrity": "sha1-nhBXzKhRq7kzmPizOuGHuZyuwRo=",
-      "dev": true,
-      "requires": {
-        "crypto-random-string": "^1.0.0"
-      }
-    },
-    "unzip-response": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npm.taobao.org/unzip-response/download/unzip-response-2.0.1.tgz",
-      "integrity": "sha1-0vD3N9FrBhXnKmk17QQhRXLVb5c=",
-      "dev": true
-    },
-    "update-notifier": {
-      "version": "2.5.0",
-      "resolved": "https://registry.npm.taobao.org/update-notifier/download/update-notifier-2.5.0.tgz",
-      "integrity": "sha1-0HRFk+E/Fh5AassdlAi3LK0Ir/Y=",
-      "dev": true,
-      "requires": {
-        "boxen": "^1.2.1",
-        "chalk": "^2.0.1",
-        "configstore": "^3.0.0",
-        "import-lazy": "^2.1.0",
-        "is-ci": "^1.0.10",
-        "is-installed-globally": "^0.1.0",
-        "is-npm": "^1.0.0",
-        "latest-version": "^3.0.0",
-        "semver-diff": "^2.0.0",
-        "xdg-basedir": "^3.0.0"
-      }
-    },
     "uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npm.taobao.org/uri-js/download/uri-js-4.2.2.tgz",
@@ -2750,15 +2341,6 @@
         "punycode": "^2.1.0"
       }
     },
-    "url-parse-lax": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npm.taobao.org/url-parse-lax/download/url-parse-lax-1.0.0.tgz",
-      "integrity": "sha1-evjzA2Rem9eaJy56FKxovAYJ2nM=",
-      "dev": true,
-      "requires": {
-        "prepend-http": "^1.0.1"
-      }
-    },
     "uuid": {
       "version": "3.3.3",
       "resolved": "https://registry.npm.taobao.org/uuid/download/uuid-3.3.3.tgz",
@@ -2803,15 +2385,6 @@
         "isexe": "^2.0.0"
       }
     },
-    "widest-line": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npm.taobao.org/widest-line/download/widest-line-2.0.1.tgz",
-      "integrity": "sha1-dDh2RzDsfvQ4HOTfgvuYpTFCo/w=",
-      "dev": true,
-      "requires": {
-        "string-width": "^2.1.1"
-      }
-    },
     "word-wrap": {
       "version": "1.2.3",
       "resolved": "https://registry.npm.taobao.org/word-wrap/download/word-wrap-1.2.3.tgz",
@@ -2832,29 +2405,6 @@
       "requires": {
         "mkdirp": "^0.5.1"
       }
-    },
-    "write-file-atomic": {
-      "version": "2.4.3",
-      "resolved": "https://registry.npm.taobao.org/write-file-atomic/download/write-file-atomic-2.4.3.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fwrite-file-atomic%2Fdownload%2Fwrite-file-atomic-2.4.3.tgz",
-      "integrity": "sha1-H9Lprh3z51uNjDZ0Q8aS1MqB9IE=",
-      "dev": true,
-      "requires": {
-        "graceful-fs": "^4.1.11",
-        "imurmurhash": "^0.1.4",
-        "signal-exit": "^3.0.2"
-      }
-    },
-    "xdg-basedir": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npm.taobao.org/xdg-basedir/download/xdg-basedir-3.0.0.tgz",
-      "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=",
-      "dev": true
-    },
-    "yallist": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npm.taobao.org/yallist/download/yallist-2.1.2.tgz?cache=0&sync_timestamp=1569874223546&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fyallist%2Fdownload%2Fyallist-2.1.2.tgz",
-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
-      "dev": true
     }
   }
 }
diff --git a/node-crash-course/package.json b/node-crash-course/package.json
index 61c342d..5b6b854 100644
--- a/node-crash-course/package.json
+++ b/node-crash-course/package.json
@@ -22,7 +22,7 @@
     "eslint-plugin-import": "^2.19.1",
     "eslint-plugin-node": "^10.0.0",
     "eslint-plugin-prettier": "^3.1.2",
-    "nodemon": "^2.0.2",
+    "nodemon": "^2.0.22",
     "prettier": "^1.19.1"
   }
 }