Mark SIP 34 as completed

Implemented in Scala 2.13 in scala/scala#5969
Implemented in Scala 3 in scala/scala3#3841

Author: julienrf

content/right-associative-by-name-operators.md

@@ -1,7 +1,8 @@
 ---
 layout: sip
 title: SIP-34 - Right-Associative By-Name Operators
-vote-status: accepted
+vote-status: complete
+vote-text: This SIP has been implemented in Scala 2.13.0 and Scala 3.0.0
 permalink: /sips/:title.html
 redirect_from: /sips/pending/right-associative-by-name-operators.html
 ---