Fix image URL

README.md

@@ -7,12 +7,12 @@
     it under the terms of the GNU General Public Licence as published by
     the Free Software Foundation, either version 3 of the Licence, or
     (at your option) any later version.
-   
+
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
     GNU General Public Licence for more details.
-   
+
     You should have received a copy of the GNU General Public Licence
     along with this program. If not, see <http://www.gnu.org/licenses/>.
 
@@ -43,5 +43,6 @@
    1.0
 
 ##Screenshot
-![screenshot](look-up.PNG)
+
+![](https://code.envrm.info/src/look-up/raw/branch/master/look-up.png)