feat: add "-mincov" flag option (Issue #19)

[KEINOS]

Feature fix of issue #19

• uncovered option to display only less than 100% coverage #19

[KEINOS]

@msoap

I think the PR passes the CI.
However, in Go 1.19, staticcheck analysis gives us an error that io/ioutil is deprecated. They want us to use io and os packages instead of ioutil.

$ golangci-lint run
go-carpet.go:7:2: SA1019: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details. (staticcheck)
	"io/ioutil"
	^
utils_test.go:4:2: SA1019: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details. (staticcheck)
	"io/ioutil"
	^

Do you want me to fix this in the PR as well?

[msoap]

@KEINOS sorry for delay.

Do you want me to fix this in the PR as well?

better to fix it in separated pr, or i can fix it later

[KEINOS]

@msoap

better to fix it in separated pr

I agree. Let's have them in a separate PR!
Please run the workflow and review when you got time.

[msoap]

also i've fixed golangci-lint warnings in master, please merge master to your branch

[KEINOS]

also i've fixed golangci-lint warnings in master, please merge master to your branch

Rebased to the PR. How about now?

[msoap]

@KEINOS thanks for contributing!

[KEINOS]

@msoap

Please release the changes when you got time.

The go install github.com/msoap/go-carpet@latest won't work as described in the README, the -mincov option.

[msoap]

@KEINOS i've released - https://github.com/msoap/go-carpet/releases/tag/v1.10.0

[KEINOS]

@msoap Thank you! Now it works 👍 !