Have prebib use python3 rather than python3.6.

ltratt · ltratt · commit 210359dee84d · 2019-06-12T11:34:41.000+01:00
Tested to work fine on at least python3.7.
diff --git a/bin/prebib b/bin/prebib
@@ -1,4 +1,4 @@
-#! /usr/bin/env python3.6
+#! /usr/bin/env python3
 # ---------------------------------------------------------------------
 # Soft-dev Bibtex Preprocessor
 # ---------------------------------------------------------------------

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-#! /usr/bin/env python3.6`
	`1`	`+#! /usr/bin/env python3`
`2`	`2`	`# ---------------------------------------------------------------------`
`3`	`3`	`# Soft-dev Bibtex Preprocessor`
`4`	`4`	`# ---------------------------------------------------------------------`