Document the release of CppSharp 0.10.1

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

docs/releases/CppSharp-0.10.1-4.7.2019.md

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+# CppSharp 0.10.1 7.4.2019
+
+* Fix the getting of references to pointers in C#
+
+* Fix the passing of references to pointers in C#
+
+* Prefer non-mapped types when resolving ambiguous overloads
+
+* Make indexers use non-trivial copy ctors if any
+
+* Fix a memory leak when passing an indirect std::string
+
+* Build the generator before test bindings for easy testing
+
+* Fix memory leaks in the map for std::string
+
+* Fix the passing of std::string by value
+
+* Guard against null for objects passed by value
+
+* Generate valid C# for implicit conversion to const char*