imported UnknownHostException where necessary and updated version

src/android/com/synconset/CordovaHTTP/CordovaHttpDownload.java

@@ -9,6 +9,7 @@ import com.github.kevinsawicki.http.HttpRequest;
 import com.github.kevinsawicki.http.HttpRequest.HttpRequestException;
 
 import java.io.File;
+import java.net.UnknownHostException;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.Map;

src/android/com/synconset/CordovaHTTP/CordovaHttpGet.java

@@ -7,6 +7,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.net.MalformedURLException;
 import java.net.URL;
+import java.net.UnknownHostException;
 import java.util.Map;
 
 import javax.net.ssl.HttpsURLConnection;

src/android/com/synconset/CordovaHTTP/CordovaHttpUpload.java

@@ -4,6 +4,7 @@
 package com.synconset;
 
 import java.io.File;
+import java.net.UnknownHostException;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.Iterator;