Bump v0.28.2

Bump v0.28.1

win: Fix running spec

Merge pull request electron#1897 from atom/dumpsyms

mac: Build dump_syms

Merge pull request electron#1834 from hokein/master

Ship pdf.dll in release, fix electron#1826

Bump v0.27.1

Bump v0.27.0

Bump v0.26.1

Bump v0.26.0

Bump v0.25.3