Release v1.0.4

CHANGES:

* before updating we need to init the submodule (#37).

* Add GitHub Actions CI (@tmcgilchrist #42 #44).

* Various fixes for OCaml cucumber (@tmcgilchrist #41).

* Improve odoc documentation and add an example.

* Update base to v0.15.1 updating OCaml lower bound to 4.10.0.

* Update README with a working example.

* Fixup linking against libgherkin.

* Adapt to the interface changes when updating to gherkin-c v23.

* Move git submodule to https://github.com/cucumber/gherkin monorepo.

* Fixup cmdliner deprecations and update dune.

* Updated README to read a bit better.

* Updated Readme to reflect the new build steps.

* Removed unnecessary submodule.

* Updated dune project information to get things ready for release.

* Updated dune files to use autogenerated opam.

* Updated test make file to work with new dune build stucture.

* Updated files to work with Dune's foreign lib interface.

* Added gherkin-c READ ONLY as a submodule.

* Updated based on rebase from master.

* Added dialect example in the README.

* Moved initialization of result code.

* Added whitespace for readability.

* Added the Dialect module to allow compile time checking of supported dialects of Cucumber

* Created a means for indicating feature file dialect.

* Removed unneeded flag in dune. * Removed unneeded flag in dune * Added freeing before caml_failwith just to ensure that everything is cleaned up before going back to OCaml runtime.

* Refactored long code block into function in gherkin_intf.c. * Refactored long code block into function in gherkin_intf.c * Fixed small memory leak due to TokenScanner not being deleted after it is done being used

* Added const qualifier to sFileName to fix #31.

Updated the C code to conform to libgherkin 7.0.4

* Updated the C code to conform to libgherkin 7.0.4
* Added a README note about the current working version

Bumped version number to 1.0.2

Bumped cucumber.opam version number in prep for release

Bump version number in the opam file to complete release