Bump rubytree from 1.0.2 to 2.0.0

Bumps [rubytree](https://github.com/evolve75/RubyTree) from 1.0.2 to 2.0.0.
- [Release notes](https://github.com/evolve75/RubyTree/releases)
- [Changelog](https://github.com/evolve75/RubyTree/blob/master/API-CHANGES.md)
- [Commits](https://github.com/evolve75/RubyTree/compare/R1.0.2...R2.0.0)

---
updated-dependencies:
- dependency-name: rubytree
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -415,9 +415,8 @@ GEM
     ruby-vips (2.1.4)
       ffi (~> 1.12)
     ruby2_keywords (0.0.5)
-    rubytree (1.0.2)
-      json (~> 2.6.1)
-      structured_warnings (~> 0.4.0)
+    rubytree (2.0.0)
+      json (~> 2.0, > 2.3.1)
     rubyzip (2.3.2)
     sass-rails (6.0.0)
       sassc-rails (~> 2.1, >= 2.1.1)
@@ -475,7 +474,6 @@ GEM
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
     ssrf_filter (1.0.7)
-    structured_warnings (0.4.0)
     telegraf (2.1.0)
       influxdb
     temple (0.8.2)