Documented new conceal options

Author: Chin Leung

README.md

@@ -80,6 +80,15 @@ variables:
     let g:javascript_conceal_arrow_function       = "⇒"
     let g:javascript_conceal_noarg_arrow_function = "🞅"
     let g:javascript_conceal_underscore_arrow_function = "🞅"
+    let g:javascript_conceal_double_equal = "≈"
+    let g:javascript_conceal_triple_equal = "≡"
+    let g:javascript_conceal_or_operator = "∨"
+    let g:javascript_conceal_and_operator = "∧"
+    let g:javascript_conceal_not_operator = "¬"
+    let g:javascript_conceal_greater_equal_operator = "≥"
+    let g:javascript_conceal_less_equal_operator = "≤"
+    let g:javascript_conceal_not_equal_operator = "≠"
+    let g:javascript_conceal_not_strict_equal_operator = "≢"
 
 
 You can enable concealing within VIM with: