v2.3.0

• feat: add base62 flag to enable shorter keys
• fix entry manager tests
• golint: add missing error checks
• golint: fix view issues discovered by golint
• parsers: handle form parse error
• render: respond error if couldn't write the response
• golint: handle for db rollback and commit errors
• golint key.go
• feat: add basex to encode keys to base62
• feat: update entry key accessed time
• feat: handle errors in EntryMigration Alter method
• feat: delete expired entry keys
• refactor: use ticket to delete expired entries periodically
• feat(tests): refactor tests to use testify assertions
• refactor: use key's stringer interface to get keystring
• refactor: use the key.Key type wherever the subject is a key
• refactor: move key string/byte casting to key package
• add hurl tests for reading a secret several times