Bump minitest-bisect from 1.5.1 to 1.6.0 (#389)

Bumps [minitest-bisect](https://github.com/seattlerb/minitest-bisect) from 1.5.1 to 1.6.0.
- [Release notes](https://github.com/seattlerb/minitest-bisect/releases)
- [Changelog](https://github.com/seattlerb/minitest-bisect/blob/master/History.rdoc)
- [Commits](minitest/minitest-bisect@v1.5.1...v1.6.0)

---
updated-dependencies:
- dependency-name: minitest-bisect
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Gemfile.lock

@@ -32,7 +32,7 @@ GEM
       mixlib-shellout
     method_source (1.0.0)
     minitest (5.14.4)
-    minitest-bisect (1.5.1)
+    minitest-bisect (1.6.0)
       minitest-server (~> 1.0)
       path_expander (~> 1.1)
     minitest-server (1.0.6)
@@ -50,7 +50,7 @@ GEM
     parallel (1.22.1)
     parser (3.1.2.1)
       ast (~> 2.4.1)
-    path_expander (1.1.0)
+    path_expander (1.1.1)
     pry (0.14.1)
       coderay (~> 1.1)
       method_source (~> 1.0)