Make the async Client default (#626)

The previously default Client is moved to `reqwest::blocking`, while the
async client becomes the main API.

Closes #622

src/async_impl/body.rs

@@ -33,7 +33,7 @@ impl Body {
     /// # Example
     ///
     /// ```
-    /// # use reqwest::r#async::Body;
+    /// # use reqwest::Body;
     /// # use futures;
     /// # fn main() {
     /// let chunks: Vec<Result<_, ::std::io::Error>> = vec![

src/async_impl/multipart.rs

@@ -61,7 +61,7 @@ impl Form {
     /// # Examples
     ///
     /// ```
-    /// let form = reqwest::r#async::multipart::Form::new()
+    /// let form = reqwest::multipart::Form::new()
     ///     .text("username", "seanmonstar")
     ///     .text("password", "secret");
     /// ```

src/async_impl/request.rs

@@ -194,8 +194,8 @@ impl RequestBuilder {
     /// # use reqwest::Error;
     ///
     /// # async fn run() -> Result<(), Error> {
-    /// let client = reqwest::r#async::Client::new();
-    /// let form = reqwest::r#async::multipart::Form::new()
+    /// let client = reqwest::Client::new();
+    /// let form = reqwest::multipart::Form::new()
     ///     .text("key3", "value3")
     ///     .text("key4", "value4");
     ///
@@ -329,7 +329,7 @@ impl RequestBuilder {
     /// # use reqwest::Error;
     /// #
     /// # async fn run() -> Result<(), Error> {
-    /// let response = reqwest::r#async::Client::new()
+    /// let response = reqwest::Client::new()
     ///     .get("https://hyper.rs")
     ///     .send()
     ///     .await?;

src/async_impl/response.rs

@@ -186,7 +186,7 @@ impl Response {
     /// # Example
     ///
     /// ```
-    /// # use reqwest::r#async::Response;
+    /// # use reqwest::Response;
     /// fn on_response(res: Response) {
     ///     match res.error_for_status() {
     ///         Ok(_res) => (),
@@ -216,7 +216,7 @@ impl Response {
     /// # Example
     ///
     /// ```
-    /// # use reqwest::r#async::Response;
+    /// # use reqwest::Response;
     /// fn on_response(res: &Response) {
     ///     match res.error_for_status_ref() {
     ///         Ok(_res) => (),
@@ -347,25 +347,6 @@ struct ResponseUrl(Url);
 pub trait ResponseBuilderExt {
     /// A builder method for the `http::response::Builder` type that allows the user to add a `Url`
     /// to the `http::Response`
-    ///
-    /// # Example
-    ///
-    /// ```
-    /// # extern crate url;
-    /// # extern crate http;
-    /// # extern crate reqwest;
-    /// # use std::error::Error;
-    /// use url::Url;
-    /// use http::response::Builder;
-    /// use reqwest::r#async::ResponseBuilderExt;
-    /// # fn main() -> Result<(), Box<dyn Error>> {
-    /// let response = Builder::new()
-    ///     .status(200)
-    ///     .url(Url::parse("http://example.com")?)
-    ///     .body(())?;
-    ///
-    /// #   Ok(())
-    /// # }
     fn url(&mut self, url: Url) -> &mut Self;
 }