Implement 'do' statement #105

[flexferrum]

No description provided.

[codecov-io]

Codecov Report

Merging #109 into master will increase coverage by 0.11%.
The diff coverage is 98.59%.

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
+ Coverage   87.03%   87.15%   +0.11%     
==========================================
  Files          54       54              
  Lines        6072     6133      +61     
==========================================
+ Hits         5285     5345      +60     
- Misses        787      788       +1

Impacted Files	Coverage Δ
include/jinja2cpp/error_info.h	100% <ø> (ø)	⬆️
src/lexer.h	86.3% <ø> (ø)	⬆️
test/errors_test.cpp	100% <100%> (ø)	⬆️
src/template_parser.cpp	94.25% <100%> (+0.17%)	⬆️
src/expression_parser.cpp	95.73% <100%> (ø)	⬆️
include/jinja2cpp/template_env.h	100% <100%> (ø)	⬆️
src/statements.cpp	93.41% <100%> (+0.03%)	⬆️
test/expressions_test.cpp	79.31% <100%> (+10.07%)	⬆️
src/error_info.cpp	49.07% <100%> (+0.96%)	⬆️
src/template_parser.h	89.97% <100%> (+0.08%)	⬆️
... and 2 more

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