2.1.1

Added

• Annotate -[RACSignal if:then:else:] lightweight generic (#43). Thanks @erichoracek!
• Annotate ValueType lightweight generics on bind blocks (#44). Thanks @erichoracek!

Fixed

• Only build pushes to master and PRs on CI (#50). Thanks @andersio!
• Remove 404 link in README (#54). Thanks @jpaffrath!
• Annotate ValueType on -[RACSequence objectPassingTest:] (#64). Thanks @erichoracek!
• Fix -[RACSignal bufferWithTime:] return value (#66). Thanks @sprynmr!
• Remove unnecessary header guard (#67). Thanks @haifengkao!

Thanks to @mdiep and @ikesyo for the reviews!