Update README.md

Author: flexferrum

README.md

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 C++ implementation of big subset of Jinja2 template engine features. This library was inspired by [Jinja2CppLight](https://github.com/hughperkins/Jinja2CppLight) project and brings support of mostly all Jinja2 templates features into C++ world. Unlike [inja](https://github.com/pantor/inja) lib, you have to build Jinja2Cpp, but it has only one dependence: boost.
 
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 # Table of contents
 
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