fix speedup in 1.16 release post

Author: steveklabnik

_posts/2017-03-16-Rust-1.16.md

@@ -65,7 +65,7 @@ depends." Here are some very un-scientific benchmarks:
 |-----------------|---------|---------|--------|
 | initial build   | 134.75s | 236.78s | 15.27s |
 | initial check   | 50.88s  | 148.52s | 12.81s |
-| speedup         | 2.648   | 1.594   | 0.015  |
+| speedup         | 2.648   | 1.594   | 1.192  |
 | secondary build | 15.97s  | 64.34s  | 13.54s |
 | secondary check | 2.9s    | 9.29s   | 12.3s  |
 | speedup         | 5.506   | 6.925   | 1.100  |