(chore)badge: add a goreport badge to chaos-exporter repo (#38)

Signed-off-by: ksatchit <[email protected]>

README.md

@@ -1,6 +1,7 @@
 # Litmus Chaos Exporter
 [![BUILD STATUS](https://travis-ci.org/litmuschaos/chaos-exporter.svg?branch=master)](https://travis-ci.org/litmuschaos/chaos-exporter)
 [![BCH compliance](https://bettercodehub.com/edge/badge/litmuschaos/chaos-exporter?branch=master)](https://bettercodehub.com/)
+[![Go Report Card](https://goreportcard.com/badge/github.com/litmuschaos/chaos-exporter)](https://goreportcard.com/report/github.com/litmuschaos/chaos-exporter)
 
 - This is a custom prometheus exporter to expose Litmus Chaos metrics. 
   To learn more about Litmus Chaos Experiments & the Litmus Chaos Operator, 
@@ -68,4 +69,4 @@ c_exp_engine_nginx_container_kill{app_uid="3f2092f8-6400-11e9-905f-42010a800131"
 # HELP c_exp_engine_nginx_pod_failure 
 # TYPE c_exp_engine_nginx_pod_failure gauge
 c_exp_engine_nginx_pod_failure{app_uid="3f2092f8-6400-11e9-905f-42010a800131"} 3
-```
+```