Parse "Defined:" from profile output with functions

[blueyed]

Ref: vim/vim#3329

Waiting for vim-jp/issues#1178.

[codecov]

Codecov Report

Merging #52 into master will decrease coverage by 0.08%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master      #52      +/-   ##
==========================================
- Coverage   97.38%   97.29%   -0.09%     
==========================================
  Files          15       15              
  Lines        1567     1592      +25     
  Branches      166      172       +6     
==========================================
+ Hits         1526     1549      +23     
- Misses         28       29       +1     
- Partials       13       14       +1

Flag	Coverage Δ
#py27	97.04% <93.33%> (-0.09%)	⬇️
#py34	95.72% <93.33%> (-0.06%)	⬇️
#py35	96.54% <93.33%> (-0.08%)	⬇️
#py36	96.54% <93.33%> (-0.08%)	⬇️
#py37	96.54% <93.33%> (-0.08%)	⬇️

Impacted Files	Coverage Δ
tests/test_main.py	100% <100%> (ø)	⬆️
covimerage/__init__.py	91.31% <90%> (-0.2%)	⬇️

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