chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeperio-bot

yarn.lock

@@ -972,7 +972,7 @@ browserify-zlib@^0.2.0:
   dependencies:
     pako "~1.0.5"
 
-buffer-from@^1.0.0:
+buffer-from@^1.0.0, buffer-from@^1.1.0:
   version "1.1.0"
   resolved "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.0.tgz#87fcaa3a298358e0ade6e442cfce840740d1ad04"
 
@@ -6850,11 +6850,12 @@ ts-loader@^4.4.1:
     micromatch "^3.1.4"
     semver "^5.0.1"
 
-ts-node@^6.1.0:
-  version "6.1.0"
-  resolved "https://registry.npmjs.org/ts-node/-/ts-node-6.1.0.tgz#a2c37a11fdb58e60eca887a1269b025cf4d2f8b8"
+ts-node@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.npmjs.org/ts-node/-/ts-node-7.0.0.tgz#a94a13c75e5e1aa6b82814b84c68deb339ba7bff"
   dependencies:
     arrify "^1.0.0"
+    buffer-from "^1.1.0"
     diff "^3.1.0"
     make-error "^1.1.1"
     minimist "^1.2.0"