Bump assertj version + enable findbugs in the test files.
Bump assertj version + enable findbugs in the test files.

Credits to @PascalSchumacher for helping us figure this out.

mcpherrinm/keywhiz,square/keywhiz,square/keywhiz,madtrax/keywhiz,madtrax/keywhiz,mcpherrinm/keywhiz,square/keywhiz,mcpherrinm/keywhiz,madtrax/keywhiz,mcpherrinm/keywhiz,madtrax/keywhiz