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

Merge pull request Tencent#378 from Tencent/hotfix_1.0.24

fix tabs

Merge pull request Tencent#321 from Tencent/dev

v1.0.23

Merge pull request Tencent#279 from Tencent/dev

update pod spec

Merge pull request Tencent#273 from Tencent/dev

v1.0.20