Remove babel-runtime

Looks like we don't use it for anything.

Author: nene

.babelrc

@@ -4,7 +4,6 @@
     ],
     "plugins": [
         "add-module-exports",
-        "transform-runtime",
         "transform-class-properties",
         "transform-function-bind",
         "transform-object-rest-spread",

package-lock.json

@@ -40,7 +40,6 @@
     "url": "https://github.com/zeroturnaround/sql-formatter/issues"
   },
   "dependencies": {
-    "babel-runtime": "^6.18.0",
     "lodash": "^4.16.0"
   },
   "devDependencies": {
@@ -55,7 +54,6 @@
     "babel-plugin-transform-es3-property-literals": "^6.5.0",
     "babel-plugin-transform-function-bind": "^6.8.0",
     "babel-plugin-transform-object-rest-spread": "^6.8.0",
-    "babel-plugin-transform-runtime": "^6.8.0",
     "babel-preset-es2015": "^6.14.0",
     "cross-env": "^3.1.3",
     "eslint": "^3.7.1",