Documented the release of CppSharp 0.8.18.

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

docs/releases/CppSharp-0.8.18-28.1.2018.md

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+# CppSharp 0.8.17 25.12.2017
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+Do not generate wrappers for template specializations if original method in template class is ignored.
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+Add one more include path which Linux usually expects.
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+Evaluate expressions for enums generated using GenerateEnumFromMacros
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+Evaluate expressions when generating enum from macros - ExpressionEvaluator taken from https://github.com/codingseb/ExpressionEvaluator
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+Set the name-space for enums generated from macros.
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+Preliminary script for building 32-bit Nuget package
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+Field property getter returns non-value types by reference instead of by copy.
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+Update VS check when downloading pre-compiled LLVM packages.
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+Add `IgnoreConversionToProperty(pattern)` and `ForceConversionToProperty(pattern)`.
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+Add `UsePropertyDetectionHeuristics` option to `DriverOptions`.
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+Add "run" to verbs.txt
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+Added support for 16-bit wide characters (char16_t).
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+Fixed the generated C++ for symbols when protected classes need them.
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+Removed the possibility for conflicts between overloads when generating C++ for symbols.