Use a specific version of JetBrains Annotations and bump version to 2.0-rc15

Author: velitasali

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>org.monora.coolsocket</groupId>
     <artifactId>core</artifactId>
-    <version>2.0-rc14</version>
+    <version>2.0-rc15</version>
     <name>CoolSocket</name>
     <description>Bidirectional TCP socket layer and server</description>
     <url>https://github.com//libcoolsocket/java</url>
@@ -58,7 +58,7 @@
         <dependency>
             <groupId>org.jetbrains</groupId>
             <artifactId>annotations</artifactId>
-            <version>RELEASE</version>
+            <version>16.0.2</version>
             <scope>compile</scope>
         </dependency>
     </dependencies>