Register json filters.

[mattcoley]

I thought these were loaded in through reflection 🤦‍♂️

[codecov-io]

Codecov Report

Merging #216 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #216      +/-   ##
============================================
+ Coverage     71.44%   71.46%   +0.02%     
- Complexity     1363     1364       +1     
============================================
  Files           217      217              
  Lines          4297     4297              
  Branches        683      683              
============================================
+ Hits           3070     3071       +1     
+ Misses          986      985       -1     
  Partials        241      241

Impacted Files	Coverage Δ	Complexity Δ
.../com/hubspot/jinjava/lib/filter/FilterLibrary.java	100% <ø> (ø)	4 <0> (ø)	⬇️
...a/com/hubspot/jinjava/lib/filter/ToJsonFilter.java	66.66% <0%> (+16.66%)	4% <0%> (+1%)	⬆️

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