Update copyright year #32

Job	Run time
build-android (armeabi-v7a)	46s
build-android (armeabi-v7a with NEON)	28s
build-android (arm64-v8a)	51s
build-appletvos (objc_arc)	57s
build-emscripten	3m 21s
build-android (x86)	28s
build-appletvos (no_objc_arc)	2m 2s
build-android (x86_64)	41s
build-appletvsimulator (objc_arc)	24s
build-appletvsimulator (no_objc_arc)	47s
build-iphoneos (objc_arc)	3m 10s
build-iphoneos (no_objc_arc)	57s
build-iphonesimulator (objc_arc)	27s
build-iphonesimulator (no_objc_arc)	31s
build-macosx (objc_arc)	1m 27s
build-macosx (no_objc_arc)	1m 2s
	18m 19s

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