more lifetime elision in generated code

[dwrensha]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 52.45%. Comparing base (ab342b3) to head (34d57a3).
Report is 117 commits behind head on master.

Files with missing lines	Patch %	Lines
capnpc/src/codegen.rs	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #532      +/-   ##
==========================================
+ Coverage   51.64%   52.45%   +0.81%     
==========================================
  Files          69       70       +1     
  Lines       33735    34570     +835     
==========================================
+ Hits        17422    18135     +713     
- Misses      16313    16435     +122     

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