chore(travis): Enable Travis CI (#4)

- Add Travis CI configuration file
- Update dev dependencies
- Update NodeJS version for Travis CI

.nvmrc

@@ -1 +1 @@
-7.8.0
+7.9.0

.travis.yml

@@ -0,0 +1,16 @@
+language: node_js
+cache:
+  directories:
+    - node_modules
+notifications:
+  email: false
+
+branches:
+  only:
+    - master
+    - develop
+
+before_install:
+  - npm install -g npm
+install:
+  - npm install

package.json

@@ -1,7 +1,7 @@
 {
 	"name": "simple-progress-webpack-plugin",
 	"description": "A simple progress plugin for Webpack, coming with four different logging output formats.",
-	"version": "0.0.0",
+	"version": "1.0.0",
 	"author": {
 		"name": "Dominique Müller",
 		"email": "dominique.m.mueller@gmail.com",
@@ -33,6 +33,6 @@
 		"webpack": ">= 2.0.0 < 3.0.0"
 	},
 	"devDependencies": {
-		"webpack": "2.3.x"
+		"webpack": "2.4.x"
 	}
 }