chore(crawl): fix field type (#14)

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "spider"
-version = "1.3.0"
+version = "1.3.1"
 authors = ["madeindjs <contact@rousseau-alexandre.fr>"]
 description = "Multithreaded Web spider crawler written in Rust."
 repository = "https://github.com/madeindjs/spider"

README.md

@@ -24,7 +24,7 @@ Add this dependency to your _Cargo.toml_ file.
 
 ```toml
 [dependencies]
-spider = "1.2.2"
+spider = "1.3.1"
 ```
 
 Then you'll be able to use library. Here is a simple example:
@@ -55,7 +55,7 @@ website.configuration.verbose = true; // Defaults to false
 website.configuration.delay = 2000; // Defaults to 250 ms
 website.configuration.concurrency = 10; // Defaults to 4
 website.configuration.user_agent = "myapp/version"; // Defaults to spider/x.y.z, where x.y.z is the library version
-website.on_link_find_callback = |s| { println!("link target: {}", s); s } // Callback to run on each link find
+website.on_link_find_callback = |s| { println!("link target: {}", s); s }; // Callback to run on each link find
 
 website.crawl();
 ```

src/website.rs

@@ -29,7 +29,7 @@ pub struct Website<'a> {
     /// contains page visited
     pages: Vec<Page>,
     /// callback when a link is found
-    on_link_find_callback: fn(String) -> String,
+    pub on_link_find_callback: fn(String) -> String,
     /// Robot.txt parser holder
     robot_file_parser: RobotFileParser<'a>,
 }