#99 added mustBeValid method to Any class

[keremulutas]

Added the "mustBeValid" and "test_not_found" methods.

I had to change the JsonException exception field of NotFoundAny from private to protected, so that I could access the exact reason of value being not found.

When I run the tests I have 12 failed - even if I clone your repo and run the tests without any changes - I can't tell if there is a problem with the code I introduced. Sorry for the inconvenience.

[codecov-io]

Codecov Report

Merging #100 into master will increase coverage by 4.14%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
+ Coverage   67.59%   71.74%   +4.14%     
==========================================
  Files          90       90              
  Lines        6404     6409       +5     
  Branches     1225     1230       +5     
==========================================
+ Hits         4329     4598     +269     
+ Misses       1660     1405     -255     
+ Partials      415      406       -9

Impacted Files	Coverage Δ
src/main/java/com/jsoniter/any/NotFoundAny.java	60.86% <ø> (+3.72%)	⬆️
src/main/java/com/jsoniter/any/Any.java	58.18% <0%> (-2.01%)	⬇️
.../main/java/com/jsoniter/CodegenImplObjectHash.java	28.8% <0%> (-64.8%)	⬇️
src/main/java/com/jsoniter/Codegen.java	46.42% <0%> (-11.31%)	⬇️
src/main/java/com/jsoniter/IterImpl.java	61.76% <0%> (-5.15%)	⬇️
...c/main/java/com/jsoniter/output/CodegenResult.java	85.33% <0%> (-0.78%)	⬇️
...ain/java/com/jsoniter/CodegenImplObjectStrict.java	84.14% <0%> (-0.25%)	⬇️
src/main/java/com/jsoniter/spi/GenericsHelper.java	44.89% <0%> (ø)	⬆️
...java/com/jsoniter/extra/NamingStrategySupport.java
... and 36 more

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