remove deprecated

src/crypto.rs

@@ -163,9 +163,6 @@ macro_rules! make_currency {
                 }
             }
 
-            #[deprecated(since="0.2.3", note="Use `as_str()`")]
-            pub fn to_str(&self) -> &'static str { self.as_str() }
-
             pub fn to_str_uppercase(&self) -> &'static str {
                 match *self {
                     $(
@@ -424,9 +421,6 @@ macro_rules! make_exchange {
                 }
             }
 
-            #[deprecated(since="0.2.3", note="Use `as_str()`")]
-            pub fn to_str(&self) -> &'static str { self.as_str() }
-
             pub fn as_str(&self) -> &'static str {
                 match *self {
                     $(
@@ -638,9 +632,6 @@ macro_rules! ticker_to_u8 {
                 }
             }
 
-            #[deprecated(since="0.2.3", note="Use `as_str()`")]
-            pub fn to_str(&self) -> &'static str { self.as_str() }
-
             pub fn to_str_uppercase(&self) -> &'static str {
                 match *self {
                     $(