bump version to 0.3 #768

Job	Run time
msvc-x64, Release, Shared=ON	6m 45s
msvc-x64, Release, Shared=OFF	6m 20s
clang-x64, Release, Shared=ON	7m 6s
clang-x64, Release, Shared=OFF	7m 40s
msvc-x64, RelWithDebInfo, Shared=ON	6m 15s
msvc-x64, RelWithDebInfo, Shared=OFF	5m 52s
clang-x64, RelWithDebInfo, Shared=ON	8m 6s
clang-x64, RelWithDebInfo, Shared=OFF	7m 35s
msvc-Win32, RelWithDebInfo, Shared=ON	5m 58s
msvc-Win32, RelWithDebInfo, Shared=OFF	6m 1s
clang-Win32, RelWithDebInfo, Shared=ON	8m 25s
clang-Win32, RelWithDebInfo, Shared=OFF	8m 25s
	1h 24m 28s

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