Handle orderBy in nested queries

[igdianov]

Fixes #21

[codecov-io]

Codecov Report

Merging #22 into master will increase coverage by 1.76%.
The diff coverage is 69.23%.

@@             Coverage Diff              @@
##             master      #22      +/-   ##
============================================
+ Coverage     58.56%   60.32%   +1.76%     
- Complexity      196      202       +6     
============================================
  Files            21       21              
  Lines          1390     1399       +9     
  Branches        197      200       +3     
============================================
+ Hits            814      844      +30     
+ Misses          475      449      -26     
- Partials        101      106       +5

Impacted Files	Coverage Δ	Complexity Δ
.../query/schema/impl/GraphQLJpaQueryDataFetcher.java	95.55% <ø> (ø)	20 <0> (ø)	⬇️
...a/query/schema/impl/QraphQLJpaBaseDataFetcher.java	65.61% <ø> (+0.37%)	83 <0> (ø)	⬇️
...ry/schema/impl/GraphQLJpaOneToManyDataFetcher.java	69.64% <69.23%> (+49.64%)	9 <3> (+6)	⬆️

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