Bump rexml from 3.2.5 to 3.2.8 (#43)

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.5 to 3.2.8.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.5...v3.2.8)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: indirect
...

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

Gemfile.lock

@@ -12,14 +12,14 @@ GEM
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     ast (2.4.2)
-    backport (1.1.2)
     byebug (11.0.1)
     coderay (1.1.2)
     concurrent-ruby (1.1.10)
     crack (0.4.5)
       rexml
     diff-lcs (1.3)
     docile (1.3.2)
+    eventmachine (1.2.7)
     ffi (1.11.2)
     formatador (0.2.5)
     guard (2.16.1)
@@ -43,8 +43,8 @@ GEM
     htmlentities (4.3.4)
     i18n (1.12.0)
       concurrent-ruby (~> 1.0)
-    jaro_winkler (1.5.4)
     json (2.5.1)
+    kramdown (1.17.0)
     listen (3.2.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -77,7 +77,8 @@ GEM
     regexp_parser (2.2.1)
     reverse_markdown (1.3.0)
       nokogiri
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec (3.9.0)
       rspec-core (~> 3.9.0)
       rspec-expectations (~> 3.9.0)
@@ -115,18 +116,17 @@ GEM
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
     slop (4.9.2)
-    solargraph (0.37.2)
-      backport (~> 1.1)
-      bundler (>= 1.17.2)
+    solargraph (0.29.5)
+      eventmachine (~> 1.2, >= 1.2.5)
       htmlentities (~> 4.3, >= 4.3.4)
-      jaro_winkler (~> 1.5)
-      nokogiri (~> 1.9, >= 1.9.1)
+      kramdown (~> 1.16)
       parser (~> 2.3)
       reverse_markdown (~> 1.0, >= 1.0.5)
       rubocop (~> 0.52)
       thor (~> 0.19, >= 0.19.4)
       tilt (~> 2.0)
       yard (~> 0.9)
+    strscan (3.1.0)
     thor (0.20.3)
     tilt (2.0.10)
     timecop (0.9.5)