Update seq.el to v1.8

* seq.el: Update to version 1.8.
* test/seq.el-test.el (test-seq-let): Update to version
1.8.

seq.el

@@ -4,7 +4,7 @@
 
 ;; Author: Nicolas Petton <[email protected]>
 ;; Keywords: sequences
-;; Version: 1.7
+;; Version: 1.8
 ;; Package: seq
 
 ;; Maintainer: [email protected]
@@ -279,7 +279,7 @@ Equality is defined by TESTFN if non-nil or by `equal' if nil."
               '()))
 
 (defun seq-difference (seq1 seq2 &optional testfn)
-  "Return a list of th elements that appear in SEQ1 but not in SEQ2.
+  "Return a list of the elements that appear in SEQ1 but not in SEQ2.
 Equality is defined by TESTFN if non-nil or by `equal' if nil."
   (seq-reduce (lambda (acc elt)
                 (if (not (seq-contains-p seq2 elt testfn))
@@ -325,6 +325,16 @@ TYPE can be one of the following symbols: vector, string or list."
     (`list (append seq nil))
     (t (error "Not a sequence type name: %S" type))))
 
+(defun seq-min (seq)
+  "Return the smallest element of SEQ.
+SEQ must be a sequence of numbers or markers."
+  (apply #'min (seq-into seq 'list)))
+
+(defun seq-max (seq)
+    "Return the largest element of SEQ.
+SEQ must be a sequence of numbers or markers."
+  (apply #'max (seq-into seq 'list)))
+
 (defun seq--drop-list (list n)
   "Return a list from LIST without its first N elements.
 This is an optimization for lists in `seq-drop'."
@@ -442,7 +452,7 @@ If no element is found, return nil."
 (unless (fboundp 'elisp--font-lock-flush-elisp-buffers)
   ;; In Emacs≥25, (via elisp--font-lock-flush-elisp-buffers and a few others)
   ;; we automatically highlight macros.
-  (add-to-list 'emacs-lisp-mode-hook #'seq--activate-font-lock-keywords))
+  (add-hook 'emacs-lisp-mode-hook #'seq--activate-font-lock-keywords))
 
 (provide 'seq)
 ;;; seq.el ends here

test/seq.el-test.el

@@ -297,5 +297,10 @@ Evaluate BODY for each created sequence.
       (should (null b))
       (should (null c)))))
 
+(ert-deftest test-seq-min-max ()
+  (with-test-sequences (seq '(4 5 3 2 0 4))
+    (should (= (seq-min seq) 0))
+    (should (= (seq-max seq) 5))))
+
 (provide 'seq-tests)
 ;;; seq-tests.el ends here