add umd build

Author: leonardodino

.gitignore

@@ -1,3 +1,4 @@
 node_modules/
 .nyc_output
-coverage
+coverage
+dist

package.json

@@ -15,6 +15,8 @@
     "compileEnhancements": false,
     "babel": false
   },
+  "unpkg": "./dist/main.js",
+  "umd:main": "./dist/main.js",
   "browser": {
     "./src/deploy/index.js": "./src/deploy/index.browser.js"
   },
@@ -68,7 +70,9 @@
     "npm-run-all": "^4.1.3",
     "nyc": "^13.0.1",
     "prettier": "^1.13.7",
-    "tape": "^4.9.1"
+    "tape": "^4.9.1",
+    "webpack": "^4.20.2",
+    "webpack-cli": "^3.1.2"
   },
   "engines": {
     "node": ">=8.0.0"
@@ -90,7 +94,9 @@
   "scripts": {
     "build": "run-s build:*",
     "build:deptree": "depcruise --exclude '^node_modules' --output-type dot src | dot -T svg > site/dist/dependencygraph.svg",
+    "build:webpack": "webpack --mode production --devtool source-map --output-library NetlifyClient --output-library-target umd",
     "ci": "run-s test build",
+    "prepublishOnly": "npm run build:webpack",
     "report": "nyc report --reporter=text-lcov | coveralls",
     "test": "run-s test:*",
     "test:ava": "nyc --reporter=lcov ava --verbose && nyc report",