use native certs in reqwest

closes #21

Cargo.lock

@@ -2353,6 +2353,7 @@ dependencies = [
  "percent-encoding",
  "pin-project-lite",
  "rustls",
+ "rustls-native-certs",
  "rustls-pemfile",
  "serde",
  "serde_json",
@@ -2368,7 +2369,6 @@ dependencies = [
  "wasm-bindgen-futures",
  "wasm-streams",
  "web-sys",
- "webpki-roots",
  "winreg",
 ]
 
@@ -2454,6 +2454,18 @@ dependencies = [
  "sct",
 ]
 
+[[package]]
+name = "rustls-native-certs"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9aace74cb666635c918e9c12bc0d348266037aa8eb599b5cba565709a8dff00"
+dependencies = [
+ "openssl-probe",
+ "rustls-pemfile",
+ "schannel",
+ "security-framework",
+]
+
 [[package]]
 name = "rustls-pemfile"
 version = "1.0.4"