Update README with kext-dev-mode warning and updated installer link

Author: pje

README.md

@@ -1,14 +1,22 @@
 ## WavTap
 
-Capture whatever your mac is playing to a .wav file on your Desktop—as simply as a screenshot
+Capture whatever your mac is playing to a .wav file on your Desktop—as simply as a screenshot.
 
 ![](screenshot.png)
 
-(this is alpha software. it's sorta stable, with caveats.)
+(This is alpha software. It will cause your computer to catch fire. 🔥)
 
 #### Installation
 
-run the [installer](https://github.com/downloads/pje/WavTap/WavTap%200.2.0.pkg).
+Run the [installer](https://github.com/pje/WavTap/releases/download/0.3.0/WavTap.0.3.0.pkg).
+
+**NB**: As of 10.10, OSX now bans drivers that haven't received explicit approval from Apple. The only workaround I'm aware of is to set a system flag to [globally allow **all** unsigned kernel extensions](http://apple.stackexchange.com/questions/163059/how-can-i-disable-kext-signing-in-mac-os-x-10-10-yosemite). This means WavTap *will not work* unless you've enabled `kext-dev-mode`, using something like this:
+
+```shell
+sudo nvram boot-args=kext-dev-mode=1
+```
+
+Yes, [this sucks](https://www.gnu.org/philosophy/can-you-trust.html).
 
 #### Uninstallation