upgrade some crates, fix scrap benchmark on mac, fix compile issue on

osx10.14

src/client.rs

@@ -2233,7 +2233,7 @@ fn get_pk(pk: &[u8]) -> Option<[u8; 32]> {
 
 #[inline]
 fn get_rs_pk(str_base64: &str) -> Option<sign::PublicKey> {
-    if let Ok(pk) = base64::decode(str_base64) {
+    if let Ok(pk) = crate::decode64(str_base64) {
         get_pk(&pk).map(|x| sign::PublicKey(x))
     } else {
         None