Fix coverage, add usage

Author: Ruben Schmidmeister

.travis.yml

@@ -7,6 +7,6 @@ install:
 - npm install -g codecov istanbul
 
 script:
-- ./node_modules/.bin/standard
-- istanbul cover ./node_modules/mocha/bin/_mocha --reporter lcovonly -- -R spec
+- ./node_modules/.bin/standard index.js
+- istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec
 - codecov

README.md

@@ -17,3 +17,10 @@ Install with:
 npm i --save @rschmidmeister/random.js
 ```
 
+Usage:
+
+```
+const random = require('@rschmidmeister/random.js')
+
+console.log(random())
+```

package.json

@@ -4,7 +4,7 @@
   "description": "A deterministic random number generator for node",
   "main": "index.js",
   "scripts": {
-    "test": "standard . && mocha"
+    "test": "standard index.js && mocha"
   },
   "repository": {
     "type": "git",