linter warning fix

Author: captain-torch

src/lib/output/themes/default/DefaultThemeRenderContext.ts

@@ -46,7 +46,7 @@ function bind<F, L extends any[], R>(fn: (f: F, ...a: L) => R, first: F) {
 
 export class DefaultThemeRenderContext {
     options: Options;
-    private currentDepth: number = 0;
+    private currentDepth = 0;
 
     constructor(private theme: DefaultTheme, options: Options) {
         this.options = options;