fix builder definition. derp.

Author: BurntSushi

text/0000-regex-1.0.md

@@ -316,36 +316,36 @@ impl RegexBuilder {
   pub fn build(&self) -> Result<Regex, Error>;
 
   /// Set the case insensitive flag (i).
-  pub fn case_insensitive(&mut self, yes: bool);
+  pub fn case_insensitive(&mut self, yes: bool) -> &mut RegexBuilder;
 
   /// Set the multi line flag (m).
-  pub fn multi_line(&mut self, yes: bool);
+  pub fn multi_line(&mut self, yes: bool) -> &mut RegexBuilder;
 
   /// Set the dot-matches-any-character flag (s).
-  pub fn dot_matches_new_line(&mut self, yes: bool);
+  pub fn dot_matches_new_line(&mut self, yes: bool) -> &mut RegexBuilder;
 
   /// Set the swap-greedy flag (U).
-  pub fn swap_greed(&mut self, yes: bool);
+  pub fn swap_greed(&mut self, yes: bool) -> &mut RegexBuilder;
 
   /// Set the ignore whitespace flag (x).
-  pub fn ignore_whitespace(&mut self, yes: bool);
+  pub fn ignore_whitespace(&mut self, yes: bool) -> &mut RegexBuilder;
 
   /// Set the Unicode flag (u).
-  pub fn unicode(&mut self, yes: bool);
+  pub fn unicode(&mut self, yes: bool) -> &mut RegexBuilder;
 
   /// Set the approximate size limit (in bytes) of the compiled regular
   /// expression.
   ///
   /// If compiling a pattern would approximately exceed this size, then
   /// compilation will fail.
-  pub fn size_limit(&mut self, limit: usize);
+  pub fn size_limit(&mut self, limit: usize) -> &mut RegexBuilder;
 
   /// Set the approximate size limit (in bytes) of the cache used by the DFA.
   ///
   /// This is a per thread limit. Once the DFA fills the cache, it will be
   /// wiped and refilled again. If the cache is wiped too frequently, the
   /// DFA will quit and fall back to another matching engine.
-  pub fn dfa_size_limit(&mut self, limit: usize);
+  pub fn dfa_size_limit(&mut self, limit: usize) -> &mut RegexBuilder;
 }
 ```