Adding stream.end() to writeLog method
Improving error message for writelog tests
Using callback in writelog
Using appendFile method for writeLog
Adding tests for coverage class
Using writeSync in append mode for write log, added node v 10 for travis
Adding version 0.10.1 for travis
Merge remote-tracking branch 'upstream/master'
Merge pull request #63 from pranavparikh/master

Enabled write log tests for proxymanager, added tests for coverage class and v0.10.1 for travis builds