Add global jsonrpc ref for umd bundle and fix webpack warning#17

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antongolub wants to merge 10 commits intoteambition:masterfrom antongolub:master

+142-636

Commits on Oct 27, 2019

fix: expose jsonrpc lib as global variable
antongolub
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Commits on Oct 28, 2019

Commits on Oct 29, 2019

ci(travis): remove node_js v6 build, add 12, 13 versions instead
antongolub
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Commits on Oct 30, 2019

ci: handle node_js v6
antongolub
committed