Update README.md

Merge pull request louthy#330 from bender2k14/feature/implement_IsDef…

…ault_via_new_method_on_Check

utilzing the Check class to implement IsDefault extension method

Merge pull request louthy#325 from bender2k14/feature/reorganize_null…

…_checking_code

Feature/reorganize null checking code

Fix bugs in toMapUpdate and toMapTry

Fix for IfFailThrow not throwing if an internal operation caught the …

…exception and returned it as Result

louthy#264

2.1.14

Validation serialisation

Merge branch 'master' of https://github.com/louthy/language-ext

Record types: ToString and Serialisation

 - Default ToString() behviour added to Record
 - Default ISerializable implementation for Record
 - New Attributes for opting out of:
   - Equals() - OptOutOfEq
   - CompareTo() - OptOutOfOrd
   - GetHashCode() - OptOutOfHashCode
   - ToString() - OptOutOfToString
   - Serialization - OptOutOfSerialization (can also use NonSerializable