Update package.json version to 1.5.0

This is a large update, including among other things a host of custom
command improvements (including the multitargeted command feature),
timezoned logging, configurable streaming, broadcast streaming, support
for long lists of results in search and library, and support for
request-from-library.

Signed-off-by: Ryan Hodin <ryan951357@gmail.com>

Author: za419

package.json

@@ -1,6 +1,6 @@
 {
   "name": "CadenceBot",
-  "version": "1.4.2",
+  "version": "1.5.0",
   "description": "A Discord bot which acts as a client to Cadence Radio (http://cadenceradio.com/), enabling playback, search, querying of the currently playing song, and requesting songs to be played.",
   "keywords": [
     "cadence",