Bump antlr4-runtime from 4.5.1 to 4.8-1

Bumps [antlr4-runtime](https://github.com/antlr/antlr4) from 4.5.1 to 4.8-1.
- [Release notes](https://github.com/antlr/antlr4/releases)
- [Changelog](https://github.com/antlr/antlr4/blob/master/CHANGES.txt)
- [Commits](https://github.com/antlr/antlr4/commits)

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

Closes #72

Change-Id: I4ee970b774e1fe8bb46bd56def35dfedde06232b
diff --git a/pom.xml b/pom.xml
index cbc03f9..508043e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -59,7 +59,7 @@
 		<dependency>
 			<groupId>org.antlr</groupId>
 			<artifactId>antlr4-runtime</artifactId>
-			<version>4.5.1</version>
+			<version>4.8-1</version>
 		</dependency>
 		<dependency>
 			<groupId>org.antlr</groupId>