v0.3.0

Changelog

bump dependencies internal dependencies:

- go 1.15
+ go 1.17
require( 
-   code.cloudfoundry.org/credhub-cli v0.0.0-20210705130154-e13c0e0f2a0a
+   code.cloudfoundry.org/credhub-cli v0.0.0-20211004130317-313b3a1fa385
-   github.com/prometheus/common v0.29.0
+   github.com/prometheus/common v0.31.1
)