Update photonlib and photonlib example license headers to MIT (#395)

photon-server/src/main/java/org/photonvision/Main.java

@@ -14,6 +14,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
+
 package org.photonvision;
 
 import edu.wpi.first.cscore.CameraServerCvJNI;