Add Changelog.txt

Author: OpenCppCoverage

Changelog.txt

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+Version 0.9.4.2
+	- Add a button to select and deselect all projects (https://github.com/OpenCppCoverage/OpenCppCoveragePlugin/pull/9)
+	- Add better colors for different themes for covered and not covered lines (https://github.com/OpenCppCoverage/OpenCppCoveragePlugin/pull/10)
+	- Fix an issue when defining an environment variable in Visual Studio that alreay exists in the system environment.
+
+Version 0.9.4.1
+	- Coverage can be directly run from project contextual menu in the window Solution Explorer
+	- Fix the issue Cannot find tool: VCCLCompilerTool for projects generated by CMake
+    - Fix a random issue in Visual Studio 2017. Run Coverage button builds the project but not always run the code coverage