Upgrade golang to 1.11

• Distribution archive was changed to include persist/options.proto

v2.1.0: Typemapping overhaul (#83)

* type mapping overhaul

* sql mapping done

* spanner example builds

* minor fixes

New method to generate before and after hooks

• see #82

v2.0.0: Hooks builder instead of imported static functions (#82)

* cleanup, initial hook refactor

* remove comment

* add hooks to the builder

* test new before hooks

* remove dead code

* minor changes to generated code

* remove extra spanner

* remove dead code

* update docs

v1.0.0

Changes:

• separate generated handlers from custom ones
• make hooks and type mapping safer and easier.
• generate safe to use helper package

v0.2

Changes:

• multiline query strings
• Removed type struct code generation in order to add more flexibility
• bug fixes

v0.1.0

fix travis file