improve merging profiles

[shogo82148]

fixes #172

[coveralls]

Coverage remained the same at 12.075% when pulling b063ca2 on shogo82148:improve-merging-profiles into 769aead on mattn:master.

[coveralls]

Coverage remained the same at 12.075% when pulling a580f65 on shogo82148:improve-merging-profiles into 769aead on mattn:master.

[shogo82148]

Test fails because of https://golang.org/doc/go1.15#flag

When the flag package sees -h or -help, and those flags are not defined, it now prints a usage message. If the FlagSet was created with ExitOnError, FlagSet.Parse would then exit with a status of 2. In this release, the exit status for -h or -help has been changed to 0. In particular, this applies to the default handling of command line flags.

[gaocegege]

/lgtm

Thanks! 🎉 👍

[shogo82148]

Raw Output:
gocover.go:81:90: SA4000: identical expressions on the left and right side of the '==' operator (staticcheck)
		if a.StartLine == b.StartLine && a.StartCol == b.StartCol && a.EndLine == b.EndLine && b.EndCol == b.EndCol {

oops, I'll fix it. Thanks 🐶