cache more builds in asv

Author: arashbm

asv.conf.json

@@ -156,7 +156,7 @@
     // `asv` will cache results of the recent builds in each
     // environment, making them faster to install next time.  This is
     // the number of builds to keep, per environment.
-    // "build_cache_size": 2,
+    "build_cache_size": 200,
 
     // The commits after which the regression search in `asv publish`
     // should start looking for regressions. Dictionary whose keys are