Adds test to check license end year.

Author: mukulmishra18

test/test.js

@@ -1,5 +1,6 @@
 var assert = require('chai').assert
 var nock = require('nock')
+var fs = require('fs')
 
 var TEST_HOST = 'https://api.test.com'
 
@@ -241,3 +242,18 @@ describe('Client', function () {
     })
   })
 })
+
+describe('LICENSE', function() {
+  it('should have correct end year', function(done) {
+    var licenseFile = fs.readFileSync('LICENSE.txt', 'utf8')
+    var licenseYearRange = licenseFile.split('\n')[2].split(' ')[2]
+    var endYear = licenseYearRange.split('-')[1]
+    var thisYear = (new Date()).getFullYear()
+
+    if (endYear != thisYear) {
+      assert.fail(thisYear, endYear, "LICENSE end year is not correct")
+    } else {
+      done()
+    }
+  })
+})