Remove unused exceptions

lib/src/main/java/me/lortseam/completeconfig/exception/IllegalAnnotationParameterException.java

@@ -9,8 +9,4 @@ public class IllegalAnnotationParameterException extends RuntimeException {
         super(message);
     }
 
-    public IllegalAnnotationParameterException(Throwable cause) {
-        super(cause);
-    }
-
 }

lib/src/main/java/me/lortseam/completeconfig/exception/IllegalReturnTypeException.java

@@ -1,12 +0,0 @@
-package me.lortseam.completeconfig.exception;
-
-/**
- * Thrown to indicate that a method returns an illegal or inappropriate type.
- */
-public class IllegalReturnTypeException extends RuntimeException {
-
-    public IllegalReturnTypeException(String message) {
-        super(message);
-    }
-
-}