icons updated

Author: neSpecc

assets/icon-h1.svg

@@ -1,6 +1,6 @@
 {
   "name": "@editorjs/header",
-  "version": "2.6.2",
+  "version": "2.7.0",
   "keywords": [
     "codex editor",
     "header",

assets/icon-h2.svg

@@ -35,3 +35,8 @@
 .ce-header[contentEditable=true][data-placeholder]:empty:focus::before {
   display: none;
 }
+
+.ce-header__tune-button svg {
+  width: 16px;
+  height: 16px;
+}