Rename markdownToPlainText -> stripMarkdownFormatting

It better reflects what the function actually does

lib/utils/markdown.dart

@@ -44,7 +44,7 @@ class MarkdownBuilder implements md.NodeVisitor {
   }
 }
 
-String markdownToPlainText(String markdown) {
+String stripMarkdownFormatting(String markdown) {
   final List<String> lines = markdown.replaceAll('\r\n', '\n').split('\n');
   var doc = md.Document(encodeHtml: false);
 

lib/widgets/journal_list.dart

@@ -77,7 +77,7 @@ class JournalList extends StatelessWidget {
       title = basename(journal.filePath);
     }
 
-    var body = markdownToPlainText(journal.body);
+    var body = stripMarkdownFormatting(journal.body);
 
     var textTheme = Theme.of(context).textTheme;
     var children = <Widget>[];

test/strip_markdown_formatting_test.dart

@@ -2,10 +2,10 @@ import 'package:journal/utils/markdown.dart';
 import 'package:test/test.dart';
 
 void main() {
-  group('Markdown To Text', () {
+  group('Markdown Remove Formatting', () {
     test('Test Headers', () {
       var input = '# Hello\nHow are you?';
-      expect(markdownToPlainText(input), 'Hello How are you?');
+      expect(stripMarkdownFormatting(input), 'Hello How are you?');
     });
 
     test('Test Header2', () {
@@ -15,7 +15,7 @@ void main() {
 Hello
       """;
 
-      expect(markdownToPlainText(input), 'Test Header Hello');
+      expect(stripMarkdownFormatting(input), 'Test Header Hello');
     });
 
     test('Itemized LIsts', () {
@@ -26,7 +26,7 @@ look like:
   * that one
       """;
 
-      expect(markdownToPlainText(input),
+      expect(stripMarkdownFormatting(input),
           'Itemized lists look like: this one that one');
     });
   });