doc: use HTTPS for links

PR #18

Author: atouchet

README.md

@@ -4,9 +4,9 @@ A high level Rust wrapper library for [PCRE2](https://www.pcre.org/).
 
 [![Linux build status](https://api.travis-ci.org/BurntSushi/rust-pcre2.png)](https://travis-ci.org/BurntSushi/rust-pcre2)
 [![Windows build status](https://ci.appveyor.com/api/projects/status/github/BurntSushi/rust-pcre2?svg=true)](https://ci.appveyor.com/project/BurntSushi/rust-pcre2)
-[![](http://meritbadge.herokuapp.com/pcre2)](https://crates.io/crates/pcre2)
+[![](https://meritbadge.herokuapp.com/pcre2)](https://crates.io/crates/pcre2)
 
-Dual-licensed under MIT or the [UNLICENSE](http://unlicense.org).
+Dual-licensed under MIT or the [UNLICENSE](https://unlicense.org/).
 
 
 ### Documentation

pcre2-sys/README.md

@@ -4,9 +4,9 @@ Bindings for [PCRE2](https://www.pcre.org/).
 
 [![Linux build status](https://api.travis-ci.org/BurntSushi/rust-pcre2.png)](https://travis-ci.org/BurntSushi/rust-pcre2)
 [![Windows build status](https://ci.appveyor.com/api/projects/status/github/BurntSushi/rust-pcre2?svg=true)](https://ci.appveyor.com/project/BurntSushi/rust-pcre2)
-[![](http://meritbadge.herokuapp.com/pcre2-sys)](https://crates.io/crates/pcre2-sys)
+[![](https://meritbadge.herokuapp.com/pcre2-sys)](https://crates.io/crates/pcre2-sys)
 
-Dual-licensed under MIT or the [UNLICENSE](http://unlicense.org).
+Dual-licensed under MIT or the [UNLICENSE](https://unlicense.org/).
 
 
 ### Documentation