remove non-Free clause from licence

Author: Lawrence D'Oliveiro

LICENSE

@@ -23,16 +23,3 @@ AUTHORS OR COPYRIGHT 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.
-
-==============================================================
-LICENSE FOR CONTENT PROCEDURALLY GENERATED USING THIS SOFTWARE
-==============================================================
-
-All content procedurally generated by this software and its permutations
-are licensed under Creative Commons Attribution By 3.0:
-
-https://creativecommons.org/licenses/by/3.0/
-
-If in doubt, please get in touch. As a rule of thumb I'm fine with anyone
-using these spaceships in commercial works, but I am less okay with people
-selling the spaceship models directly for commercial gain. Use common sense.