Fix typos (#185)

Found via `codespell -S package-lock.json -L ist,als,sie`

Author: kianmeng

CHANGELOG.md

@@ -75,7 +75,7 @@ Align `ol` and `ul` elements to match paragraph indentation.
 ### 0.2.12
 
 -   Fixes indentation of images wrapped in `<p>` tags ([#48](https://github.com/danburzo/percollate/issues/48))
--   Adds basic styles for tables ([#50](https://github.com/danburzo/percollate/issues/50)), figures, defition terms, et cetera.
+-   Adds basic styles for tables ([#50](https://github.com/danburzo/percollate/issues/50)), figures, definition terms, et cetera.
 -   Adds a better font stack, using CSS variables
 -   Better CLI feedback with [ora](https://github.com/sindresorhus/ora) (thanks [@emersonlaurentino](https://github.com/emersonlaurentino)!)
 

README.md

@@ -353,7 +353,7 @@ To keep the tool up-to-date, you can run:
 npm install -g percollate
 ```
 
-Occasionally, an ugrade might not go according to plan; in this case, you can uninstall and re-install `percollate`:
+Occasionally, an upgrade might not go according to plan; in this case, you can uninstall and re-install `percollate`:
 
 ```bash
 npm uninstall -g percollate && npm install -g percollate

cli.js

@@ -89,7 +89,7 @@ Commands:
   html                   Bundle web pages as a HTML file.
   md                     Bundle web pages as a Markdown file.
 
-Commmon options:
+Common options:
 
   -h, --help             Output usage information.
   -V, --version          Output program version.

src/enhancements.js

@@ -3,7 +3,7 @@ import replaceElementType from './replace-element-type.js';
 import { isImageURL } from './util/file-mimetype.js';
 
 /* 
-	Convert AMP markup to HMTL markup
+	Convert AMP markup to HTML markup
 	(naive / incomplete implementation)
 */
 function ampToHtml(doc) {

test/enhancements.test.js

@@ -87,7 +87,7 @@ tape('imagesAtFullSize', t => {
 	);
 
 	t.test(
-		'should not unlink linked img elements if the link doesnt point to an image',
+		'should not unlink linked img elements if the link doesn\'t point to an image',
 		t => {
 			const doc = dom`
             <a href="/some-random-link">