add license title

It's not strictly required, but it's useful metadata, and part of the recommended license template text (see http://choosealicense.com/licenses/isc/ and https://opensource.org/licenses/isc-license)

LICENSE

@@ -1,3 +1,5 @@
+ISC License
+
 Copyright (c) 2011, Kenneth Reitz <me@kennethreitz.com>
 
 Permission to use, copy, modify, and/or distribute this software for any
@@ -10,4 +12,4 @@ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.