v0.2.1

Changelog

3121942 Don't check if API is up
61b448b Collect application metric data concurrently
a48202d Make Application an exported name
0cc2e3b Use correct command for Travis install
162f46d Improve CI stuffs
f87a62c Improve Makefile
1c3a53d Update dependencies

Docker images

• docker pull caninjas/newrelic_exporter:v0.2.1
• docker pull caninjas/newrelic_exporter:v0
• docker pull caninjas/newrelic_exporter:v0.2
• docker pull caninjas/newrelic_exporter:latest