Fix bare URLs.

MD034 - Bare URL used.

https://github.com/markdownlint/markdownlint/blob/master/docs/RULES.md#md034---bare-url-used

Author: jbampton

CHANGELOG.md

@@ -242,7 +242,7 @@ clientside JavaScript callbacks via inline strings.
   - Change `hot_reload_interval` from msec to seconds, for consistency with `hot_reload_watch_interval`
   - When called from `enable_dev_tools`, `debug=True` by default. It's still `False` by default from `run_server`.
 
-- ✨ [#744](https://github.com/plotly/dash/pull/744) Introducing Dash Testing (`dash.testing`) - read the full tutorial at https://dash.plotly.com/testing.
+- ✨ [#744](https://github.com/plotly/dash/pull/744) Introducing Dash Testing (`dash.testing`) - read the full tutorial at <https://dash.plotly.com/testing>.
 
 - [#753](https://github.com/plotly/dash/pull/753) `Component` no longer inherits `MutableMapping`, so `values`, `keys`, and more are no longer methods. Fixes an issue reported in [dcc#440](https://github.com/plotly/dash-core-components/issues/440) where components with certain prop names defined but not provided would cause a failure to render. During component generation we now disallow all props with leading underscores or matching a few remaining reserved words: `UNDEFINED`, `REQUIRED`, `to_plotly_json`, `available_properties`, and `available_wildcard_properties`.
 
@@ -568,7 +568,7 @@ app = dash.Dash(...)
 
 ## 0.20.0 - 2018-01-19
 ### Added
-- [#190](https://github.com/plotly/dash/pull/190) `exceptions.PreventUpdate` can be raised inside a callback to prevent the callback from updating the app. See https://community.plotly.com/t/improving-handling-of-aborted-callbacks/7536/2.
+- [#190](https://github.com/plotly/dash/pull/190) `exceptions.PreventUpdate` can be raised inside a callback to prevent the callback from updating the app. See <https://community.plotly.com/t/improving-handling-of-aborted-callbacks/7536/2>.
 
 ### Removed
 - Removes logging from redux middleware from production build based on process.env.NODE_ENV.
@@ -592,9 +592,9 @@ app = dash.Dash(...)
 
 ### Fixed
 - Fix a bug from 0.18.2 that removed the ability for dash to serve the app on any route besides `/`.
-- Fix a bug from 0.18.0 with the new config variables when used in a multi-app setting, causing config to be shared across apps. Originally reported in https://community.plotly.com/t/flask-endpoint-error/5691/7
+- Fix a bug from 0.18.0 with the new config variables when used in a multi-app setting, causing config to be shared across apps. Originally reported in <https://community.plotly.com/t/flask-endpoint-error/5691/7>
 - Rename config setting `supress_callback_exceptions` to `suppress_callback_exceptions`. The original spelling is kept for backward compatibility.
-- 🐞 (renderer) Fix a bug where Dash would fire updates for each parent of a grandchild node that shared the same grandparent. Originally reported in https://community.plotly.com/t/specifying-dependency-tree-traversal/5080/5
+- 🐞 (renderer) Fix a bug where Dash would fire updates for each parent of a grandchild node that shared the same grandparent. Originally reported in <https://community.plotly.com/t/specifying-dependency-tree-traversal/5080/5>
 - 🐞 (renderer) Fix a bug where the document title that displays "Updating..." wouldn't change if the callback raised an Exception. Now it will be removed on any response, even a failure.
 
 ## 0.18.2 - 2017-09-07
@@ -608,7 +608,7 @@ app = dash.Dash(...)
 ## 0.18.0 - 2017-09-07
 ### Changed
 - 🔒 Remove the `/static/` folder and endpoint that is implicitly initialized by flask. This is too implicit for my comfort level: I worry that users will not be aware that their files in their `static` folder are accessible
-- ⚡️ Remove all API calls to the Plotly API (https://api.plotly.com/), the authentication endpoints and decorators, and the associated `filename`, `sharing` and `app_url` arguments. This was never documented or officially supported. Authentication has been moved to the [`dash-auth` package](https://github.com/plotly/dash-auth).
+- ⚡️ Remove all API calls to the Plotly API (<https://api.plotly.com/>), the authentication endpoints and decorators, and the associated `filename`, `sharing` and `app_url` arguments. This was never documented or officially supported. Authentication has been moved to the [`dash-auth` package](https://github.com/plotly/dash-auth).
 - [#107](https://github.com/plotly/dash/pull/107) ✏️ Sort prop names in exception messages.
 
 ### Added

CONTRIBUTING.md

@@ -70,8 +70,8 @@ For pull request with notable file changes or a big feature development, we high
 
 Git command veterans might argue that a simple terminal and a cherry switch keyboard is the most elegant solution. But in general, a desktop tool makes the task easier.
 
-1. https://www.gitkraken.com/git-client
-2. https://desktop.github.com/
+1. <https://www.gitkraken.com/git-client>
+2. <https://desktop.github.com/>
 
 ### Emoji