Version bump curl-sys (#324)

I'd like to pull in #283 downstream so that I can close sagebind/isahc#68. Master has everything needed now, I just need a new version...

Author: sagebind

curl-sys/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "curl-sys"
-version = "0.4.25"
+version = "0.4.26"
 authors = ["Alex Crichton <[email protected]>"]
 links = "curl"
 build = "build.rs"