Fix a typo. Closes #12.

views/index.jade

@@ -12,7 +12,7 @@ html
         .header
           h1
             strong #{community}
-          h2 Enter you email in below to join #{community} on slack!
+          h2 Enter your email in below to join #{community} on slack!
         .content
           .information
             form(method="POST", action="/invite")#join-form.form