build(deps): bump koa from 2.12.0 to 2.12.1

package.json

@@ -58,7 +58,7 @@
     "fast-json-stringify": "^2.0.2",
     "humanize-number": "^0.0.2",
     "kcors": "^2.2.1",
-    "koa": "^2.12.0",
+    "koa": "2.12.1",
     "koa-bodyparser": "^4.2.0",
     "koa-compress": "^4.0.1",
     "koa-favicon": "^2.0.0",

yarn.lock

@@ -4030,7 +4030,36 @@ koa-router@^9.0.1:
     methods "^1.1.2"
     path-to-regexp "^6.1.0"
 
-koa@^2.0.0, koa@^2.12.0:
+koa@2.12.1:
+  version "2.12.1"
+  resolved "https://registry.npm.taobao.org/koa/download/koa-2.12.1.tgz?cache=0&sync_timestamp=1592059625938&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fkoa%2Fdownload%2Fkoa-2.12.1.tgz#a0ab4dcfebe3cc1b6f0875cbfd686edd7e926643"
+  integrity sha1-oKtNz+vjzBtvCHXL/Whu3X6SZkM=
+  dependencies:
+    accepts "^1.3.5"
+    cache-content-type "^1.0.0"
+    content-disposition "~0.5.2"
+    content-type "^1.0.4"
+    cookies "~0.8.0"
+    debug "~3.1.0"
+    delegates "^1.0.0"
+    depd "^1.1.2"
+    destroy "^1.0.4"
+    encodeurl "^1.0.2"
+    escape-html "^1.0.3"
+    fresh "~0.5.2"
+    http-assert "^1.3.0"
+    http-errors "^1.6.3"
+    is-generator-function "^1.0.7"
+    koa-compose "^4.1.0"
+    koa-convert "^1.2.0"
+    on-finished "^2.3.0"
+    only "~0.0.2"
+    parseurl "^1.3.2"
+    statuses "^1.5.0"
+    type-is "^1.6.16"
+    vary "^1.1.2"
+
+koa@^2.0.0:
   version "2.12.0"
   resolved "https://registry.yarnpkg.com/koa/-/koa-2.12.0.tgz#c92bfb42defd86f365c31bf63fe918db11fc5c74"
   integrity sha512-WlUBj6PXoVhjI5ljMmlyK+eqkbVFW5XQu8twz6bd4WM2E67IwKgPMu5wIFXGxAsZT7sW5xAB54KhY8WAEkLPug==