Add babashka to interpreter-mode-alist

So files with a first line of e.g. `#!/bin/env bb`
will be in clojure-mode.

CHANGELOG.md

@@ -7,6 +7,10 @@
 * Allow additional directories, beyond the default `clj[sc]`, to be correctly formulated by `clojure-expected-ns` via new `defcustom` entitled `clojure-directory-prefixes`
 * Recognize babashka projects (identified by the presence of `bb.edn`).
 
+### Changes
+
+* [#604](https://github.com/clojure-emacs/clojure-mode/pull/604): Add `bb` (babashka) to `interpreter-mode-alist`.
+
 ## 5.13.0 (2021-05-05)
 
 ### New features

clojure-mode.el

@@ -3005,7 +3005,9 @@ With universal argument \\[universal-argument], act on the \"top-level\" form."
   (add-to-list 'auto-mode-alist '("\\.cljc\\'" . clojurec-mode))
   (add-to-list 'auto-mode-alist '("\\.cljs\\'" . clojurescript-mode))
   ;; boot build scripts are Clojure source files
-  (add-to-list 'auto-mode-alist '("\\(?:build\\|profile\\)\\.boot\\'" . clojure-mode)))
+  (add-to-list 'auto-mode-alist '("\\(?:build\\|profile\\)\\.boot\\'" . clojure-mode))
+  ;; babashka scripts are Clojure source files
+  (add-to-list 'interpreter-mode-alist '("bb" . clojure-mode)))
 
 (provide 'clojure-mode)