Support config file

[k1LoW]

Support config file for gostyle.

[github-actions]

Code Metrics Report

	main (d64557f)	#23 (9e8b526)	+/-
Coverage	81.7%	71.4%	-10.4%
Code to Test Ratio	1:0.1	1:0.1	-0.0
Test Execution Time	4s	7s	+3s

Details

  |                     | main (d64557f) | #23 (9e8b526) |  +/-   |
  |---------------------|----------------|---------------|--------|
- | Coverage            |          81.7% |         71.4% | -10.4% |
  |   Files             |              6 |             8 |     +2 |
  |   Lines             |            252 |           311 |    +59 |
+ |   Covered           |            206 |           222 |    +16 |
- | Code to Test Ratio  |          1:0.1 |         1:0.1 |   -0.0 |
  |   Code              |            915 |          1072 |   +157 |
+ |   Test              |            103 |           104 |     +1 |
- | Test Execution Time |             4s |            7s |    +3s |

Code coverage of files in pull request scope (82.0% → 70.9%)

Files	Coverage	+/-
analyzer/decisions/pkgnames/pkgnames.go	77.8%	-5.6%
analyzer/decisions/recvnames/recvnames.go	82.1%	-5.8%
analyzer/decisions/underscores/underscores.go	77.2%	-3.3%
analyzer/effective/ifacenames/ifacenames.go	77.8%	-8.4%
analyzer/guide/mixedcaps/mixedcaps.go	75.0%	-3.3%
config/config.go	0.0%	0.0%
config/loader.go	5.9%	+5.9%

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Reported by octocov