RC1

• add tests for constructor flags a346867
• update API docs 1229917
• adjust subsitute* API to mirror match* on errors c49bde0
• make the exec() global flag truthy d6da660
• get test coverage squared away 4e0fee6
• reintroduce make in test script 4415d28
• rev PCRE2 library dependency 02620fd

v0.4.0...v0.9.0