don't use 'static_in_const' feature as it's not yet in stable

Author: Jorge Aparicio

src/lib.rs

@@ -347,7 +347,7 @@ use syn::*;
 
 /// List of chars that some vendors use in their peripheral/field names but
 /// that are not valid in Rust ident
-const BLACKLIST_CHARS: &[char] = &['(', ')'];
+const BLACKLIST_CHARS: &'static [char] = &['(', ')'];
 
 trait ToSanitizedPascalCase {
     fn to_sanitized_pascal_case(&self) -> Cow<str>;