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

Merge pull request Tencent#462 from Tencent/hotfix_podspec

prepare for v1.1.2

Merge pull request Tencent#447 from Tencent/hot_fix_cocoapods

upgrade MMKVCore pod spec

Merge pull request Tencent#425 from Tencent/dev

ix crc32 crash on some arm64 devices