Added rustls and native-tls features (#19)

* added rustls and native-tls features (fixes #14)

* check feature with github actions

.github/workflows/rust.yml

@@ -21,3 +21,7 @@ jobs:
       run: cargo build --features uma2
     - name: Run tests with UMA2
       run: cargo test --verbose --features uma2
+    - name: Build with rustls
+      run: cargo build --no-default-features --features rustls
+    - name: Run tests with rustls
+      run: cargo test --no-default-features --verbose --features rustls

Cargo.toml

@@ -20,9 +20,11 @@ readme = 'README.md'
 repository = 'https://github.com/kilork/openid'
 
 [features]
-default = []
+default = ['native-tls']
 microsoft = []
 uma2 = []
+native-tls = ['reqwest/native-tls']
+rustls = ['reqwest/rustls-tls']
 
 [dependencies]
 lazy_static = '1.4'

README.md

@@ -25,6 +25,13 @@ Add dependency to Cargo.toml:
 openid = "0.8"
 ```
 
+By default it uses native tls, if you want to use `rustls`:
+
+```toml
+[dependencies]
+openid = { version = "0.8", default-features = false, features = ["rustls"] }
+```
+
 ### Use case: [Warp](https://crates.io/crates/warp) web server with [JHipster](https://www.jhipster.tech/) generated frontend and [Google OpenID Connect](https://developers.google.com/identity/protocols/OpenIDConnect)
 
 This example provides only Rust part, assuming just default JHipster frontend settings.

src/lib.rs

@@ -26,6 +26,13 @@ Add dependency to Cargo.toml:
 openid = "0.8"
 ```
 
+By default it uses native tls, if you want to use `rustls`:
+
+```toml
+[dependencies]
+openid = { version = "0.8", default-features = false, features = ["rustls"] }
+```
+
 ### Use case: [Warp](https://crates.io/crates/warp) web server with [JHipster](https://www.jhipster.tech/) generated frontend and [Google OpenID Connect](https://developers.google.com/identity/protocols/OpenIDConnect)
 
 This example provides only Rust part, assuming just default JHipster frontend settings.