Bump geocoder from 1.6.7 to 1.8.1 (#62)

Bumps [geocoder](https://github.com/alexreisner/geocoder) from 1.6.7 to 1.8.1.
- [Release notes](https://github.com/alexreisner/geocoder/releases)
- [Changelog](https://github.com/alexreisner/geocoder/blob/master/CHANGELOG.md)
- [Commits](alexreisner/geocoder@v1.6.7...v1.8.1)

---
updated-dependencies:
- dependency-name: geocoder
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -19,7 +19,7 @@ GEM
       faraday-net_http (~> 2.0)
       ruby2_keywords (>= 0.0.4)
     faraday-net_http (2.0.1)
-    geocoder (1.6.7)
+    geocoder (1.8.1)
     hashdiff (1.0.1)
     json (2.6.2)
     jwt (2.3.0)