chore(release): bump version to 4.5.0

Monospace font embedding feature release. Adds bundled JetBrains Mono +
Fira Code TTFs (asarUnpack), preview/print font picker with ligatures
toggle, and embedded fonts in PDF (xelatex fontspec), DOCX (OOXML
surgery), EPUB (--epub-embed-font + OPF manifest), and HTML (sidecar
CSS with base64 data URI).

src/renderer.js

@@ -1,6 +1,6 @@
 /**
  * MarkdownConverter Renderer Process
- * @version 4.4.5
+ * @version 4.5.0
  */
 
 const { ipcRenderer } = require('electron');