Merge pull request Tencent#606 from Tencent/dev

prepare for flutter v1.2.8

Merge pull request Tencent#595 from Tencent/dev

support golang

Merge pull request Tencent#577 from Tencent/dev

update readme for flutter

Merge pull request Tencent#561 from Tencent/dev

for v.1.2.5

Merge pull request Tencent#546 from Tencent/dev

prepare pod spec for v1.2.4

Merge pull request Tencent#541 from Tencent/dev

for v1.2.3

Merge pull request Tencent#522 from Tencent/dev

MMKV for Python (on POSIX)

Merge pull request Tencent#503 from Tencent/dev

fix iOS memory warning bug

Merge pull request Tencent#486 from Tencent/dev

for v1.2.1

Merge pull request Tencent#484 from Tencent/hotfix_podspec

drop iOS 8 from podspec