[I] [Go] Dependency pmezard/go-difflib is unmaintained [arrow-go]

["asfimport (via GitHub)" <gi...@apache.org>]

asfimport opened a new issue, #75:
URL: https://github.com/apache/arrow-go/issues/75

   I saw this error (transient?) in CI
   
   ```Java
   
   Parsing meta tags from https://golang.org/x/xerrors?go-get=1 (status code 200)
   get "golang.org/x/xerrors": found meta tag get.metaImport{Prefix:"golang.org/x/xerrors", VCS:"git", RepoRoot:"https://go.googlesource.com/xerrors"} at https://golang.org/x/xerrors?go-get=1
   go: finding golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543
   go: github.com/pmezard/go-difflib@v1.0.0: unknown revision v1.0.0
   go: error loading module requirements
   ```
   
   Which led me to https://github.com/pmezard/go-difflib. It seems this package is not maintained. Should it be depended on?
   
   **Reporter**: [Wes McKinney](https://issues.apache.org/jira/browse/ARROW-8051) / @wesm
   
   <sub>**Note**: *This issue was originally created as [ARROW-8051](https://issues.apache.org/jira/browse/ARROW-8051). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*</sub>


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