Updated license file name for PPC.

LICENSE → license.md

+# License
+
 Copyright (c) 2019-2021 Biomedical Data Science (BDS), Luxembourg Centre for
 Systems Biomedicine (LCSB), University of Luxembourg, Luxembourg
 
@@ -17,4 +19,4 @@ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 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.
\ No newline at end of file
+SOFTWARE.