Filter commented lines out of .env in envup

Makes envup filter out comments in the .env file even if the line starts
with whitespace

Author: bradurani

zsh/functions/envup

@@ -2,7 +2,7 @@
 
 function envup() {
   if [ -f .env ]; then
-    export $(cat .env)
+    export $(sed '/^ *#/ d' .env)
   else
     echo 'No .env file found' 1>&2
     return 1