fix zipkin

Author: cijothomas

opentelemetry-zipkin/Cargo.toml

@@ -22,7 +22,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [features]
 default = ["reqwest-blocking-client", "reqwest/native-tls"]
-reqwest-blocking-client = ["reqwest/blocking", "opentelemetry-http/reqwest"]
+reqwest-blocking-client = ["reqwest/blocking", "opentelemetry-http/reqwest-blocking"]
 reqwest-client = ["reqwest", "opentelemetry-http/reqwest"]
 reqwest-rustls = ["reqwest", "reqwest/rustls-tls-native-roots"]