Bump org.apache.opennlp:opennlp-tools from 2.3.0 to 2.5.7

Bumps [org.apache.opennlp:opennlp-tools](https://github.com/apache/opennlp) from 2.3.0 to 2.5.7.
- [Release notes](https://github.com/apache/opennlp/releases)
- [Commits](https://github.com/apache/opennlp/compare/opennlp-2.3.0...opennlp-2.5.7)

---
updated-dependencies:
- dependency-name: org.apache.opennlp:opennlp-tools
  dependency-version: 2.5.7
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Closes #129

Change-Id: I752c5ff2da8e1a4db22ebe3f4e62fd430c470b8f
diff --git a/pom.xml b/pom.xml
index c4e5feb..25475dc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -368,7 +368,7 @@
         <dependency>
             <groupId>org.apache.opennlp</groupId>
             <artifactId>opennlp-tools</artifactId>
-            <version>2.3.0</version>
+            <version>2.5.7</version>
         </dependency>
         <dependency>
             <groupId>junit</groupId>