Unify main property in package.json [skip ci] (#7825)

packages/babel-core/package.json

@@ -2,7 +2,7 @@
   "name": "@babel/core",
   "version": "7.0.0-beta.46",
   "description": "Babel compiler core.",
-  "main": "./lib/index.js",
+  "main": "lib/index.js",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://babeljs.io/",
   "license": "MIT",

packages/babel-plugin-proposal-logical-assignment-operators/package.json

@@ -4,7 +4,7 @@
   "description": "Transforms logical assignment operators into short-circuited assignments",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-proposal-logical-assignment-operators",
   "license": "MIT",
-  "main": "lib",
+  "main": "lib/index.js",
   "keywords": [
     "babel-plugin"
   ],

packages/babel-plugin-proposal-nullish-coalescing-operator/package.json

@@ -4,7 +4,7 @@
   "description": "Remove nullish coalescing operator",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-nullish-coalescing-opearator",
   "license": "MIT",
-  "main": "lib",
+  "main": "lib/index.js",
   "keywords": [
     "babel-plugin"
   ],

packages/babel-plugin-syntax-logical-assignment-operators/package.json

@@ -4,7 +4,7 @@
   "description": "Allow parsing of the logical assignment operators",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-syntax-logical-assignment-operators",
   "license": "MIT",
-  "main": "lib",
+  "main": "lib/index.js",
   "keywords": [
     "babel-plugin"
   ],

packages/babel-plugin-syntax-nullish-coalescing-operator/package.json

@@ -4,7 +4,7 @@
   "description": "Allow parsing of the nullish-coalescing operator",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-syntax-nullish-coalescing-operator",
   "license": "MIT",
-  "main": "lib",
+  "main": "lib/index.js",
   "keywords": [
     "babel-plugin"
   ],