Bump string_cache to 0.7

Eijebong · Eijebong · commit 4cdfd2f1314c · 2017-12-07T12:38:51.000+01:00
diff --git a/markup5ever/Cargo.toml b/markup5ever/Cargo.toml
@@ -13,7 +13,7 @@ categories = [ "parser-implementations", "web-programming" ]
 path = "lib.rs"
 
 [dependencies]
-string_cache = "0.6"
+string_cache = "0.7"
 phf = "0.7"
 tendril = "0.4"
 
