[Snyk] Security upgrade rexml from 3.4.1 to 3.4.2 (#299)

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### Snyk has created this PR to fix 1 vulnerabilities in the rubygems
dependencies of this project.

#### Snyk changed the following file(s):

- `Gemfile`



<details>
<summary>⚠️ <b>Warning</b></summary>

```
Failed to update the Gemfile.lock, please update manually before merging.
```

</details>



#### Vulnerabilities that will be fixed with an upgrade:

|  | Issue | Score | 

:-------------------------:|:-------------------------|:-------------------------
![medium
severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/m.png
'medium severity') | Improper Restriction of Recursive Entity References
in DTDs (&#x27;XML Entity Expansion&#x27;)
<br/>[SNYK-RUBY-REXML-12878608](https://snyk.io/vuln/SNYK-RUBY-REXML-12878608)
| &nbsp;&nbsp;**50**&nbsp;&nbsp;




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[//]: #
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Author: Nick2bad4u

Gemfile

@@ -113,7 +113,7 @@ gem 'regexp_parser'
 gem 'reline'
 gem 'resolv'
 gem 'resolv-replace'
-gem 'rexml'
+gem 'rexml', '>= 3.4.2'
 gem 'rinda'
 gem 'rspec'
 gem 'rspec-core'