Revert Guava

Author: zapodot

pom.xml

@@ -29,7 +29,7 @@
         <junit.version>4.12</junit.version>
         <unboundid-ldapsdk.version>4.0.11</unboundid-ldapsdk.version>
         <slf4j.version>1.7.26</slf4j.version>
-        <guava.version>23.0</guava.version>
+        <guava.version>20.0</guava.version>
         <byte-buddy.version>1.9.13</byte-buddy.version>
         <logback.version>1.2.3</logback.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>