Fix: typo in PYPI_MISP_STIX_VERSION assignment in template.env (#212)

Author: neriberto

template.env

@@ -17,7 +17,7 @@ LIBFAUP_COMMIT=3a26d0a
 # PYPI_MIXBOX_VERSION="==1.0.*"
 # PYPI_CYBOX_VERSION="==2.1.*"
 # PYPI_PYMISP_VERSION="==2.4.178"
-# PYPI_MISP_STIX_VERSION"==2.4.194"
+# PYPI_MISP_STIX_VERSION="==2.4.194"
 
 # CORE_COMMIT takes precedence over CORE_TAG
 # CORE_COMMIT=0bba3f5