Test custom query

[jawoznia]

Add missing custom_query parameter in entry_points macro expansion.

Example with custom module.

[codecov[bot]]

Codecov Report

Merging #218 (7c5e41a) into cast_deps_to_empty (1be619e) will decrease coverage by 0.07%. The diff coverage is 0.00%.

@@                  Coverage Diff                   @@
##           cast_deps_to_empty     #218      +/-   ##
======================================================
- Coverage               87.86%   87.79%   -0.07%     
======================================================
  Files                      24       24              
  Lines                    1302     1303       +1     
======================================================
  Hits                     1144     1144              
- Misses                    158      159       +1     

Files Changed	Coverage Δ
sylvia-derive/src/message.rs	83.77% <0.00%> (-0.23%)	:arrow_down:
sylvia-derive/src/parser.rs	84.53% <ø> (ø)
sylvia/tests/custom_msg.rs	100.00% <ø> (ø)

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