[appveyor] Bump boost library version.

diff --git a/.appveyor.yml b/.appveyor.yml
index 8713022..003c875 100644 (file)
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -24,7 +24,7 @@ branches:
 
 environment:
   global:
-    BOOST_ROOT: C:\Libraries\boost_1_71_0
+    BOOST_ROOT: C:\Libraries\boost_1_77_0
 
 install:
 # Strawberry perl is the one to work with gcc; AppVeyor provides ActiveState perl, which is the one to work with visual.