update to the new version of sphinxversioning (change of optimization)

wscript

@@ -233,7 +233,7 @@ def write_default_params(ctx):
 
 def build_docs(ctx): 
     Logs.pprint('NORMAL', "generating HTML doc with versioning...")
-    s = 'sphinx-versioning -v build -p docs/pre_script.sh --whitelist-branches "(master|doc_versioning|release-*)" docs docs/_build/html'
+    s = 'sphinx-versioning -v build -f docs/pre_script.sh --whitelist-branches "(master|doc_versioning|release-*)" docs docs/_build/html'
     retcode = subprocess.call(s, shell=True, env=None)
 
 class BuildExtensiveTestsContext(BuildContext):
@@ -254,4 +254,4 @@ class BuildDoc(BuildContext):
 
 class BuildDoc(BuildContext):
     cmd = 'default_params'
-    fun = 'write_default_params'
\ No newline at end of file
+    fun = 'write_default_params'