0.4

• Find and Replace added.
• Show line numbers in editor (if enabled in Options dialog).
• "Save As" command added to menu bar.
• Automatically reload externally changed markdown files (on window activation).
• Smarter "Insert Bold/Italic/Strikethrough": if used within inline code
  block, then backticks will be changed to <code> and </code>.

Requirements: Java 8. Does not run with Java 9 or later.