[README.md] update

README.md

@@ -31,7 +31,9 @@ First step:
 
 ### Icons
 
-    emacs --batch --eval="(progn (package-initialize)(package-install 'all-the-icons))"
+```console
+$ emacs --batch --eval="(progn (package-initialize)(package-install 'all-the-icons))"
+```
 
 ### Markdown Mode
 - Require installed markdown in distro GNU+Linux, example:
@@ -41,9 +43,17 @@ First step:
 ### Flycheck Mode
 - Require installed the languages checking, example:
 
-  `pacman -S shellcheck`    # bash, sh
+#### bash, sh
 
-  `pacman -S python-pylint` # python
+```console
+$ pacman -S shellcheck
+```
+
+#### python
+
+```console
+$ pacman -S python-pylint
+```
 
 ### Neotree
 
@@ -56,17 +66,17 @@ So pressing `[f6]` will display
 ### Mode Python
 - Require installed virtualenv:
 
-        pacman -S python-virtualenv
+        $ pacman -S python-virtualenv
 
 - Enable or disable pyvenv-mode: <kdb>M-x</kdb> pyvenv-mode
 
 - To create virtualenv from emacs:
 
-        pyvenv-create
+        $ pyvenv-create
 
 - To activate virtualenv from emacs:
 
-        pyvenv-activate
+        $ pyvenv-activate
 
 ## Troubleshooting
 
@@ -81,19 +91,27 @@ gpg: Imposible comprobar la firma: No public key
 
 ### Method 0
 
-    gpg --homedir ~/.emacs.d/elpa/gnupg --receive-keys 066DAFCB81E42C40
+```console
+$ gpg --homedir ~/.emacs.d/elpa/gnupg --receive-keys 066DAFCB81E42C40
+```
 
 ### Method 1
 
 Disable temp signature key
 
+```console
 $ sed -i "s|(setq package-check-signature 'allow-unsigned)|(setq package-check-signature nil)|g" "$HOME/.emacs.d/init.el"
+```
 
+```console
 M-x package-install RET gnu-elpa-keyring-update RET
+```
 
 and enable signature key
 
+```console
 $ sed -i "s|(setq package-check-signature nil)|(setq package-check-signature 'allow-unsigned)|g" "$HOME/.emacs.d/init.el"
+```
 
 ## Evaluate in buffer