Fix markdown issues (#96)

See a detailed description of the rules is available at
https://github.com/markdownlint/markdownlint/blob/master/docs/RULES.md

Author: kianmeng

CHANGELOG.md

@@ -85,4 +85,3 @@ Pre-alpha v0.1.0
 $ git shortlog -s 35886a4fa6f14d3821cf5e8d0ab0428cafce5c1b...v0.1.0
      1	Amethyst Reese
 ```
-

CONTRIBUTING.md

@@ -6,19 +6,21 @@ You'll need to have Python 3.6 or newer available for testing
 
 You can do this with [pyenv][]:
 
-    $ pyenv install 3.6.x
-    $ pyenv shell 3.6.x
-
+```sh
+pyenv install 3.6.x
+pyenv shell 3.6.x
+```
 
 ## Setup
 
 Once in your development environment, install the
 appropriate linting tools and dependencies:
 
-    $ cd <path/to/aql>
-    $ make venv
-    $ source .venv/bin/activate
-
+```sh
+cd <path/to/aql>
+make venv
+source .venv/bin/activate
+```
 
 ## Submitting
 

README.md

@@ -9,7 +9,6 @@ Simple, async query library for modern Python
 [![license](https://img.shields.io/pypi/l/aql.svg)](https://github.com/omnilib/aql/blob/main/LICENSE)
 [![code style](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black)
 
-
 Highlights
 ----------
 
@@ -63,7 +62,6 @@ async with connect(...) as db:
     await db.modify(Object, rows)
 ```
 
-
 License
 -------