Added note about a minimum version.

RazrFalcon · RazrFalcon · commit 15c19775d385 · 2018-02-14T10:11:33.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,6 @@
 language: rust
 rust:
+  - 1.18.0 # don't forget to update the readme too
   - stable
   - beta
   - nightly
diff --git a/README.md b/README.md
@@ -21,3 +21,7 @@ and this to your crate root:
 ```rust
 extern crate getopts;
 ```
+
+## Rust Version Support
+
+The minimum supported Rust version is 1.18.

-Original file line number
+Diff line change
@@ @@ -1,5 +1,6 @@ @@
 language: rust
 rust:
 +  - 1.18.0 # don't forget to update the readme too
   - stable
   - beta
   - nightly