Updated license headers (#25)

src/main/groovy/org/ysb33r/gradle/ivypot/CannotUseCurrentProjectException.groovy

@@ -1,3 +1,17 @@
+//
+// ============================================================================
+// (C) Copyright Schalk W. Cronje 2013-2017
+//
+// This software is licensed under the Apache License 2.0
+// See http://www.apache.org/licenses/LICENSE-2.0 for license details
+//
+// Unless required by applicable law or agreed to in writing, software distributed under the License is
+// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and limitations under the License.
+//
+// ============================================================================
+//
+
 package org.ysb33r.gradle.ivypot
 
 import groovy.transform.CompileStatic