Migrate Travis badge from .org to .com (#139)

Author: awegrzyn

README.md

@@ -1,5 +1,5 @@
 # Monitoring
-[![travis-ci](https://api.travis-ci.org/AliceO2Group/Monitoring.svg?branch=master)](https://travis-ci.org/AliceO2Group/Monitoring)
+[![travis-ci](https://travis-ci.com/AliceO2Group/Monitoring.svg?branch=dev)](https://travis-ci.com/AliceO2Group/Monitoring)
 [![aliBuild](https://img.shields.io/badge/aliBuild-dashboard-lightgrey.svg)](https://alisw.cern.ch/dashboard/d/000000001/main-dashboard?orgId=1&var-storagename=All&var-reponame=All&var-checkname=build%2FMonitoring%2Fo2-dataflow%2F0&var-upthreshold=30m&var-minuptime=30)
 [![codecov](https://codecov.io/gh/AliceO2Group/Monitoring/branch/dev/graph/badge.svg)](https://codecov.io/gh/AliceO2Group/Monitoring/branch/dev)
 [![JIRA](https://img.shields.io/badge/JIRA-issues-blue.svg)](https://alice.its.cern.ch/jira/projects/OMON)