Bump to 18.6.0-alpha

Author: spitzerd

pom.xml

@@ -11,7 +11,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.bsplines</groupId>
   <artifactId>ltexls-plus</artifactId>
-  <version>18.5.0</version>
+  <version>18.6.0-alpha</version>
   <name>${project.groupId}:${project.artifactId}</name>
   <description>LTeX+ Language Server (LTeX LS): LSP language server for LanguageTool with support for LaTeX, Markdown, and others</description>
   <url>https://github.com/ltex-plus/ltex-ls-plus</url>