Bump version to 0.2.19 and remove Cargo config #36

Job	Run time
test-wasm	56s
generate-bindings	3m 13s
build-ios (x86_64-apple-ios)	2m 31s
test-rust	1m 5s
build-ios (aarch64-apple-ios)	2m 10s
build-android (x86_64-linux-android, x86_64-linux-android21-clang, llvm-ar)	1m 42s
build-android (aarch64-linux-android, aarch64-linux-android21-clang, llvm-ar)	2m 37s
build-android (armv7-linux-androideabi, armv7a-linux-androideabi21-clang, llvm-ar)	2m 43s
	16m 57s

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