Fix Travis CI install step

Author: dimitrinicolas

.travis.yml

@@ -4,7 +4,13 @@ node_js:
   - stable
   - "8"
 
-after_success: npm run coverage
+install:
+  - npm install
+  - npm install -g codecov
+
+after_success:
+  - npm run coverage
+  - codecov
 
 # Telegram bot
 notifications:

README.md

@@ -19,7 +19,7 @@ $ npm install postcss-import-ext-glob
 ## Usage
 
 ```js
-// Postcss plugins
+// PostCSS plugins
 postcss([
   require('postcss-import-ext-glob'),
   require('postcss-import')