add persistence of edits

README.md

@@ -47,4 +47,19 @@ t.write("I love Brython!", font=("Arial", 20, "normal"))
 
 results in an live editable code block:
 
-![Brython Demo](brython-demo.gif)
+![Brython Demo](brython-demo.gif)
+
+## Options
+
+A brython live code block can have additional options in the meta string:
+
+- `title=Some-Text` The title shown in the codeblock header. The title must be unique per page. Single hyphens/underscores (`-` and `_`) are replaced by a space, double hyphens/underscores are replaced with a single hyphen/undescore: `title=Foo-Bar--Bazz` => `Foo Bar-Bazz`; `title=Foo_Bar__Bazz` => `Foo Bar_Bazz`
+- `persistent` when added, the reset button will not be shown.
+
+
+# Storage
+
+User edited code is stored in the localStorage. To lookup the edits, id's for each codeblock are generated after the following rules:
+
+- `title` is present -> use a sanitized version as the key.
+- `title` is not present -> all codeblocks on the page are enumerated and the index number is used as the key. !! Saved Edits are probably not correctly applied.  

package.json

@@ -1,6 +1,6 @@
 {
   "name": "docusaurus-live-brython",
-  "version": "0.0.1-beta.4.21",
+  "version": "0.0.1-beta.4.58",
   "description": "Docusaurus live code block component for python.",
   "main": "src/index.js",
   "publishConfig": {
@@ -20,6 +20,7 @@
     "@fortawesome/react-fontawesome": "^0.1.14",
     "ace-builds": "^1.4.12",
     "clsx": "^1.1.1",
+    "lodash": "^4.17.21",
     "react-ace": "^9.4.1",
     "react-draggable": "^4.4.3"
   },