Merge pull request styled-components#1489 from probablyup/v3.1.6

v3.1.6

Merge pull request styled-components#1475 from probablyup/fix-mem-leak

fix streaming memory leak

Merge pull request styled-components#1465 from evan-scott-zocdoc/es-d…

…isable-speedy-ie-edge

disable speedy mode for microsoft browsers

Merge pull request styled-components#1465 from evan-scott-zocdoc/es-d…

…isable-speedy-ie-edge

disable speedy mode for microsoft browsers