0.8.6 Spellweaver susceptible to silence

Heya Zack!

Not sure if it’s intentional or an oversight, but I noticed that the Spellweaver is lacking silence immunity like the other caster classes.

Thanks your time,
Jimly the Lich

I’m not 100% happy with how the Spellweaver spec turned out in general. I will be making some changes to it in the next balance pass - not sure if it’ll gain Silence immunity or not, though!