[react-events] Use context.objectAssign in Tap responder

[trueadm]

This changes usage of object spread syntax to use the shared Object.assign helper function that we have on context, so the size of compiled Tap responder is smaller in file size (as we won't need the polyfills). According to size-bot, there's a nice 15% size saving from this change.

[sizebot]

Details of bundled changes.

Comparing: ab4951f...f120038

react-events

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-events-focus.development.js	0.0%	0.0%	10.91 KB	10.91 KB	2.36 KB	2.36 KB	UMD_DEV
react-events-focus.production.min.js	0.0%	🔺+0.1%	4.09 KB	4.09 KB	1.39 KB	1.39 KB	UMD_PROD
react-events-context-menu.development.js	0.0%	-0.1%	2.67 KB	2.67 KB	1000 B	999 B	UMD_DEV
react-events-swipe.development.js	0.0%	-0.1%	5.99 KB	5.99 KB	1.62 KB	1.62 KB	UMD_DEV
react-events-input.production.min.js	0.0%	🔺+0.1%	1.83 KB	1.83 KB	977 B	978 B	UMD_PROD
react-events-swipe.production.min.js	0.0%	-0.1%	2.43 KB	2.43 KB	1.1 KB	1.1 KB	UMD_PROD
ReactEventsTap-dev.js	+0.2%	+0.1%	15.89 KB	15.92 KB	3.48 KB	3.48 KB	FB_WWW_DEV
ReactEventsTap-prod.js	🔺+0.3%	🔺+0.1%	12.89 KB	12.93 KB	2.88 KB	2.89 KB	FB_WWW_PROD
react-events-input.development.js	0.0%	+0.1%	4.33 KB	4.33 KB	1.39 KB	1.39 KB	NODE_DEV
react-events-swipe.development.js	0.0%	-0.1%	5.81 KB	5.81 KB	1.58 KB	1.58 KB	NODE_DEV
react-events-context-menu.production.min.js	0.0%	🔺+0.2%	1.19 KB	1.19 KB	664 B	665 B	NODE_PROD
react-events-scroll.development.js	0.0%	+0.1%	6.29 KB	6.29 KB	1.65 KB	1.65 KB	UMD_DEV
react-events-hover.production.min.js	0.0%	🔺+0.1%	2.93 KB	2.93 KB	1.07 KB	1.07 KB	NODE_PROD
react-events-focus.development.js	0.0%	0.0%	10.73 KB	10.73 KB	2.31 KB	2.31 KB	NODE_DEV
react-events-press.development.js	0.0%	0.0%	20.51 KB	20.51 KB	4.77 KB	4.77 KB	NODE_DEV
react-events-press.production.min.js	0.0%	0.0%	6.78 KB	6.78 KB	2.56 KB	2.56 KB	NODE_PROD
react-events-keyboard.development.js	0.0%	0.0%	5.61 KB	5.61 KB	1.99 KB	1.99 KB	UMD_DEV
react-events-tap.development.js	-0.4%	-1.9%	16.31 KB	16.24 KB	3.59 KB	3.52 KB	UMD_DEV
react-events-tap.production.min.js	-0.2%	-2.4%	5.78 KB	5.77 KB	2.27 KB	2.22 KB	UMD_PROD
react-events-keyboard.development.js	0.0%	-0.1%	5.43 KB	5.43 KB	1.94 KB	1.93 KB	NODE_DEV
react-events-tap.development.js	-11.2%	-17.9%	18.08 KB	16.06 KB	4.23 KB	3.47 KB	NODE_DEV
react-events-drag.production.min.js	0.0%	🔺+0.1%	2.87 KB	2.87 KB	1.37 KB	1.37 KB	NODE_PROD
react-events-tap.production.min.js	-12.7%	-15.4%	6.49 KB	5.67 KB	2.6 KB	2.2 KB	NODE_PROD

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