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Feature:

1. convertor package: add ToStdBase64, ToUrlBase64, ToRawStdBase64, ToRawUrlBase64 functions.
2. datastructure package: add Optional datastructure, add Reset and refact itertor logic. add FilterByValue for HashMap.
3. function package: add predicate function logic (Or, And, Nor...), add AcceptIf function.
4. fileutil package: add CopyDir, ParallelChunkRead functions.
5. mathutil package: add CeilToFloat,CeilToString,FloorToFloat,FloorToString functions.
6. strutil package: add SubInBetween, HammingDistance functions.
7. slice package: add SetToDefaultIf functions.

Fix:

1. maputil package: fix bug of MapTo(issue #169).
2. strutil package: fix bug of After and Before function(issue #168).
3. random package: fix MAXIMUM_CAPACITY bug (issue #166)

Break Change:

1. retry package: Add retry backoff policy.
2. datastructure pacakge: rename constructor of Set (NewSet->New, NewSetFromSlice->FromSlice)，add ToSlice function for Set.
3. mathutil package: refact RoundToFloat, TruncRound, TruncRound.

Thanks @donutloop, @cannian1 , @coloraven to contribute high quality code!

Feature:

1. convertor package: add MapToStruct,ToStdBase64, ToUrlBase64, ToRawStdBase64, ToRawUrlBase64 functions.
2. fileutil package: add WriteMapsToCsv, CopyDir, ChunkRead, ParallelChunkRead functions.
3. mathutil package: add CeilToFloat,CeilToString,FloorToFloat,FloorToString functions
4. strutil package: add SubInBetween, HammingDistance functions.

Fix:

1. strutil package: fix bug of After and Before function(issue #168).

Feature:

1. fileutil package: add WriteMapsToCsv function. Support delimiter param in ReadCsvFile and WriteCsvFile.
2. slice package: add DeleteAt and add DeleteRange function.

Fix:

1. math package: fix bug of Cos function.
2. structs package: fix bug of ToMap function.

Refactor:

1. random package: improve the performance of random function.

Feature:

1. random package: add RandFloat, RandFloats, RandSymbolChar.
2. netutil package: http sendRequest support context param.
3. slice package: add Random function to get a random item from slice.

Fix:

1. validator package: fix IsChineseIdNum bug.
2. datetime package: fix IsLeapYear bug.

Feature:

1. cryptor package: add GenerateRsaKeyPair, RsaEncryptOAEP, RsaDecryptOAEP.
2. fileutil package: add ReadFile from path or url.
3. strutil package: add IsNotBlank.
4. datastructure package: ArrayQueue support auto scale.

Fix:

1. fileutil package: fix CurrentPath to support windows and linux.

Feature:

1. cryptor package: add GenerateRsaKeyPair, RsaEncryptOAEP, RsaDecryptOAEP.
2. fileutil package: add ReadFile from path or url.
3. validator package: add IsBin, IsHex, IsBase64URL, IsJWT, IsVisa, IsMasterCard, IsAmericanExpress, IsUnionPay, IsChinaUnionPay.

Feature:

1. validator package: add IsBin, IsHex, IsBase64URL, IsJWT, IsVisa, IsMasterCard, IsAmericanExpress. Is

2. slice package: add Partition.

Fix:

1. convertor package: fix the bug in cloning slices.

Feature:

1. datastructure package: add CopyOnWriteList, a thread-safe list implementation.
2. compare package: add InDelta.

Fix:

1. fileutil package: Fix bug of Zip folder.

Feature:

1. cryptor package: add base64 support for md5, hmac, sha encrypt functions.
2. datetime package: add NowDateOrTime, Timestamp, TimestampMilli, TimestampMicro, TimestampNano.
3. maputil package: add ConcurrentMap, HasKey.
4. slice package: add Join.
5. pointer package: add UnwarpOr, UnwarpOrDefault.

Fix:

1. fileutil package: Fix bug of CreateDir.

Feature:

1. cryptor package: add base64 support for md5, hmac, sha encrypt functions.
2. datetime package: add NowDateOrTime, Timestamp, TimestampMilli, TimestampMicro, TimestampNano.
3. maputil package: add HasKey.
4. slice package: add Join.

Fix:

1. fileutil package: Fix bug of CreateDir.