Move pdf-tools to file formats.

init.el

@@ -1,5 +1,5 @@
 ;;; init.el --- tastytea's Emacs init file.
-;;; Time-stamp: <2019-03-30 18:14:19 CET>
+;;; Time-stamp: <2019-03-30 18:42:24 CET>
 
 ;;; Commentary:
 ;;; I am using this file with Emacs 26, but most of it will probably work with
@@ -682,10 +682,6 @@
   :hook
   (LaTeX-mode . company-auctex-init))
 
-(use-package pdf-tools
-  :mode
-  ("\\.pdf\\'" . pdf-tools-install))
-
 ;;;;;;;;;;;;;;;;;;;; File formats ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 (use-package adoc-mode
   :mode
@@ -706,7 +702,7 @@
 
 (use-package crontab-mode
   :mode
-  (("/cron\\.d/" . crontab-mode))
+  ("/cron\\.d/" . crontab-mode)
   ("\\`'/etc/crontab\\'" . crontab-mode))
 
 (use-package nginx-mode
@@ -717,6 +713,11 @@
   :hook
   (nginx-mode . company-nginx-keywords))
 
+;; View PDF files.
+(use-package pdf-tools
+  :mode
+  ("\\.pdf\\'" . pdf-tools-install))
+
 ;;;;;;;;;;;;;;;;;;;; Server / Remote editing ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; Edit remote files.
 (unless slow-computer