Fixed #400 - Install attrs in configure

chinyeungli · chinyeungli · commit 79f824a0755f · 2019-02-20T07:53:53.000+08:00
Signed-off-by: Chin Yeung Li &lt;tli@nexb.com&gt;
diff --git a/etc/conf/base.txt b/etc/conf/base.txt
@@ -15,6 +15,7 @@ click==6.7
 six
 
 PyYAML >= 3.0, < 4.0
+attrs
 
 # license expression support
 license_expression
