chore: Use tilde dependency on babel-generator

Author: tmcw

package.json

@@ -9,7 +9,7 @@
   "dependencies": {
     "ansi-html": "^0.0.7",
     "babel-core": "^6.17.0",
-    "babel-generator": "6.25.0",
+    "babel-generator": "^6.25.0",
     "babel-plugin-system-import-transformer": "3.1.0",
     "babel-plugin-transform-decorators-legacy": "^1.3.4",
     "babel-preset-es2015": "^6.16.0",