BitString::new also const (#540)

Author: reaperhulk

README.md

@@ -23,6 +23,12 @@ $ cargo add asn1 --no-default-features
 
 ## Changelog
 
+### [Unreleased]
+
+#### Added
+
+- `BitString::new` is now `const fn`.
+
 ### [0.21.2]
 
 #### Added

src/bit_string.rs

@@ -9,7 +9,7 @@ pub struct BitString<'a> {
 }
 
 impl<'a> BitString<'a> {
-    pub fn new(data: &'a [u8], padding_bits: u8) -> Option<BitString<'a>> {
+    pub const fn new(data: &'a [u8], padding_bits: u8) -> Option<BitString<'a>> {
         if padding_bits > 7 || (data.is_empty() && padding_bits != 0) {
             return None;
         }