v0.5.1

This release picks up an updated dependency for @google-cloud/common to fix typescript compile issue for some users (e.g. #155).

Commits

• 002cf33 chore(release): bump version to 0.5.1
• 8053a41 fix: upgrade to @google-cloud/[email protected] (#158)
• cc95f61 chore(deps): lock file maintenance (#157)
• 924470a chore(deps): lock file maintenance (#156)
• a631877 chore(deps): update dependency nyc to v12 (#152)
• 0aa1e97 chore(deps): update dependency sinon to v6 (#153)
• b017ad6 fix(deps): update dependency yargs to v12 (#154)
• b65a182 chore(deps): update dependency sinon to v5.1.1 (#151)