update folder name for browser dist stuff

Author: eggplantzzz

packages/contract/.gitignore

@@ -1,4 +1,4 @@
 node_modules
 yarn.lock
 package-lock.json
-dist
+browser-dist

packages/contract/webpack.config.js

@@ -13,7 +13,7 @@ module.exports = {
   },
   output: {
     filename: "[name].js",
-    path: path.resolve(__dirname, "dist"),
+    path: path.resolve(__dirname, "browser-dist"),
     library: {
       name: "TruffleContract",
       type: "global"