Release 1.0 preparation

[flexferrum]

Resolves #132
Resolves #79

[codecov]

Codecov Report

Merging #147 into master will increase coverage by 0.69%.
The diff coverage is 85.94%.

@@           Coverage Diff            @@
##           master   #147      +/-   ##
========================================
+ Coverage   87.31%    88%   +0.69%     
========================================
  Files          64     65       +1     
  Lines        7236   8164     +928     
========================================
+ Hits         6318   7185     +867     
- Misses        918    979      +61

Impacted Files	Coverage Δ
include/jinja2cpp/filesystem_handler.h	100% <ø> (ø)	⬆️
test/macro_test.cpp	100% <ø> (ø)	⬆️
src/internal_value.h	87.66% <ø> (ø)	⬆️
src/statements.h	84.82% <ø> (ø)	⬆️
test/errors_test.cpp	99.21% <ø> (+0.4%)	⬆️
include/jinja2cpp/template.h	100% <ø> (ø)	⬆️
include/jinja2cpp/generic_list_impl.h	68.84% <ø> (+0.98%)	⬆️
src/generic_adapters.h	68.11% <ø> (+1.91%)	⬆️
include/jinja2cpp/string_helpers.h	76.47% <ø> (ø)	⬆️
include/jinja2cpp/binding/rapid_json.h	87.09% <ø> (+4.01%)	⬆️
... and 40 more

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