chore: update license

Author: cburgdorf

LICENSE

@@ -1,3 +1,5 @@
+thoughtram Training Material License (TTML 1.0)
+
 Copyright (c) 2016 thoughtram GmbH
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
@@ -15,4 +17,3 @@ PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIG
 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-