chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

yarn.lock

@@ -580,6 +580,10 @@ buffer-from@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.0.0.tgz#4cb8832d23612589b0406e9e2956c17f06fdf531"
 
+buffer-from@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.0.tgz#87fcaa3a298358e0ade6e442cfce840740d1ad04"
+
 builtin-modules@^1.0.0, builtin-modules@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/builtin-modules/-/builtin-modules-1.1.1.tgz#270f076c5a72c02f5b65a47df94c5fe3a278892f"
@@ -3418,13 +3422,13 @@ source-map-support@^0.4.15:
   dependencies:
     source-map "^0.5.6"
 
-source-map-support@^0.5.0, source-map-support@^0.5.3:
+source-map-support@^0.5.0:
   version "0.5.4"
   resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.4.tgz#54456efa89caa9270af7cd624cc2f123e51fbae8"
   dependencies:
     source-map "^0.6.0"
 
-source-map-support@^0.5.5:
+source-map-support@^0.5.5, source-map-support@^0.5.6:
   version "0.5.6"
   resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.6.tgz#4435cee46b1aab62b8e8610ce60f788091c51c13"
   dependencies:
@@ -3719,17 +3723,17 @@ ts-jest@^22.4.6:
     source-map-support "^0.5.5"
     yargs "^11.0.0"
 
-ts-node@^6.0.3:
-  version "6.0.3"
-  resolved "https://registry.yarnpkg.com/ts-node/-/ts-node-6.0.3.tgz#28bf74bcad134fad17f7469dad04638ece03f0f4"
+ts-node@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/ts-node/-/ts-node-7.0.0.tgz#a94a13c75e5e1aa6b82814b84c68deb339ba7bff"
   dependencies:
     arrify "^1.0.0"
-    chalk "^2.3.0"
+    buffer-from "^1.1.0"
     diff "^3.1.0"
     make-error "^1.1.1"
     minimist "^1.2.0"
     mkdirp "^0.5.1"
-    source-map-support "^0.5.3"
+    source-map-support "^0.5.6"
     yn "^2.0.0"
 
 tslib@^1.8.0, tslib@^1.8.1, tslib@^1.9.0: