feat (add unit test and coverage)

Author: securedeveloper

.gitignore

@@ -3,3 +3,5 @@ lib
 node_modules
 *.log
 .idea/
+/.nyc_output/
+/coverage/

.npmignore

@@ -1,2 +1,4 @@
 .babelrc
 lib
+/.nyc_output/
+/coverage/

.travis.yml

@@ -0,0 +1,7 @@
+sudo: false
+language: node_js
+node_js:
+  - 'node'
+  - '6'
+  - '5'
+  - '4'

README.md

@@ -15,34 +15,34 @@ A data export library built with and for [React](http://facebook.github.io/react
 import React from "react"
 import * from "react-data-export"
 
-class App extends React.Component {
-    const dataSet1 = [
-        {
-            name: "Johson",
-            amount: 30000,
-            sex: 'M',
-            is_married: true
-        },
-        {
-            name: "Monika",
-            amount: 355000,
-            sex: 'F',
-            is_married: false
-        },
-        {
-            name: "John",
-            amount: 250000,
-            sex: 'M',
-            is_married: false
-        },
-        {
-            name: "Josef",
-            amount: 450500,
-            sex: 'M',
-            is_married: true
-        }
-    ];
+const dataSet1 = [
+    {
+        name: "Johson",
+        amount: 30000,
+        sex: 'M',
+        is_married: true
+    },
+    {
+        name: "Monika",
+        amount: 355000,
+        sex: 'F',
+        is_married: false
+    },
+    {
+        name: "John",
+        amount: 250000,
+        sex: 'M',
+        is_married: false
+    },
+    {
+        name: "Josef",
+        amount: 450500,
+        sex: 'M',
+        is_married: true
+    }
+];
 
+class App extends React.Component {
     render() {
         return (
             <ExcelFile>