v0.4.1: fix name of force envvar

fix the name of BROWSEREXPORT_FORCE

Author: purarue

setup.py

@@ -8,7 +8,7 @@
 pkg = "browserexport"
 setup(
     name=pkg,
-    version="0.4.0",
+    version="0.4.1",
     url="https://github.com/seanbreckenridge/browserexport",
     author="Sean Breckenridge",
     author_email="[email protected]",