rpm: Support Fedora 31+ and CentOS 8+ (#55)

diff --git a/js/rpm/SPECS/js.spec b/js/rpm/SPECS/js.spec
index 944fa11..130b7ec 100644
--- a/js/rpm/SPECS/js.spec
+++ b/js/rpm/SPECS/js.spec
@@ -39,7 +39,7 @@
 BuildRequires:	python3
 %else
 Buildrequires:	nspr-devel >= 4.7
-BuildRequires:	python
+BuildRequires:	python2
 %endif
 BuildRequires:	perl
 BuildRequires:	zip