Should fix Windows failing on die.t.

Strawberry Perl 5.20.1.1 (the Appveyor version) is failing on t/die.t.
Investigating shows it's Capture::Tiny::capture_stderr() causing
Windows to crash.  Capture::Tiny 0.31 says it fixes a "hard crash
on Windows with Perl < 5.20 if a fork occurs in a capture block".

dist.ini

@@ -25,7 +25,7 @@ Exporter = 5.57
 
 [Prereqs / TestRequires]
 Test::More    = 0.88
-Capture::Tiny = 0.22
+Capture::Tiny = 0.31
 
 [MakeMaker]
 [CPANFile]