bump to v3.4.0

set version 3.3

add gcc via choco

Add homebrew

fix single include

Merge branch 'master' of https://github.com/pantor/inja

Improve support for installing with cget (#88)
* Improve support for installing with cget
* add specific version, clean cmake
* fix version to "v2.1.0"

Change std::stringstream& to std::ostream& in render_to() (#76)
* Change std::stringstream& to std::ostream& in render_to()
Fixes #75
* Expose render_to
* Update readme with example of render_to

Inja v2 (#67)
* inja2
* header only
* reduce dependencies
* code cleaning
* c++17
* use stdc++
* code cleaning
* infrastructure
* header only
* add infrastructure
* fix tests
* use minimum clang 6
* code cleaning, polyfill for c++11
* fix some file tests
* fix readme
* update appveyor
* fix polyfill and ci
* fix polyfill
* fix ci?
* test msvc __cplusplus
* add doxygen
* activate all tests
* code cleaning
* add coveralls, set default to dot notation
* add html test
* add doxygen comments
* test single_include file
* change build folder in appveyor
* correct make arguments in appveyor
* fix appveyor arguments

Fixed warning in 64-bit windows build (#24)
* Fixed passing callback arguments as reference
* Another passing as const reference instead of new instance
* Implemented variable number of parameters
-  extended function "function_regex" to pass minimum and maximum parameters. if minimum=maximum, all params are required, if minimum = 0, all params are optional.....
- for single parameter there is different regex (created by the same function_regex function) to allo read sort([1,2,3]) as one parameter
- extended Match to test if group is valid, so only valid params are filled to params vector
- new function arguments_count to test number of arguments passed to callback
* unit tests for updated callbacks with variable number of params
* merge with last version
* Optimized passing arguments as const reference
* Fixed warning on 64-bit windows (conversion from 'size_t' to 'int', possible loss of data)