doc: recommend 1.0.0 in README

AndyGauge · BurntSushi · commit 2bd2d5613cb5 · 2018-05-02T06:33:31.000-04:00
diff --git a/README.md b/README.md
@@ -29,7 +29,7 @@ Add this to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-regex = "0.2"
+regex = "1.0.0"
 ```
 
 and this to your crate root:
