remove unnecesary imports

Author: anshooarora

src/main/java/com/aventstack/extentreports/service/ExtentService.java

@@ -1,11 +1,8 @@
 package com.aventstack.extentreports.service;
 
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.IOException;
+import java.io.FileNotFoundException;
 import java.io.InputStream;
 import java.io.Serializable;
-import java.nio.file.Paths;
 import java.util.Arrays;
 import java.util.Optional;
 import java.util.Properties;