fix more clang-tidy warnings

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