README: updated technology readiness level

README.md

@@ -8,6 +8,7 @@
 [![GitHub build](https://github.com/annotation/stam-rust/actions/workflows/stam.yml/badge.svg?branch=master)](https://github.com/annotation/stam-rust/actions/)
 [![GitHub release](https://img.shields.io/github/release/annotation/stam-rust.svg)](https://GitHub.com/annotation/stam-rust/releases/)
 [![Project Status: Active – The project has reached a stable, usable state and is being actively developed.](https://www.repostatus.org/badges/latest/active.svg)](https://www.repostatus.org/#active)
+![Technology Readiness Level 7/9 - Release Candidate - Technology ready enough and in initial use by end-users in intended scholarly environments. Further validation in progress.](https://w3id.org/research-technology-readiness-levels/Level7ReleaseCandidate.svg)
 
 # STAM Python binding
 

tutorial.ipynb

@@ -5106,7 +5106,9 @@
    "cell_type": "code",
    "execution_count": 180,
    "id": "0c63ae4f-2a88-4751-9921-2a39260af146",
-   "metadata": {},
+   "metadata": {
+    "scrolled": true
+   },
    "outputs": [
     {
      "data": {
@@ -5343,7 +5345,9 @@
    "cell_type": "code",
    "execution_count": 184,
    "id": "d95e2203-e10e-4f25-a411-525d156124f0",
-   "metadata": {},
+   "metadata": {
+    "scrolled": true
+   },
    "outputs": [
     {
      "name": "stderr",