Prepare for v1.2.0 release

Author: ikappaki

README.md

@@ -92,7 +92,7 @@ $ poetry shell
 (<env>) $ jupyter notebook
 ```
 
-3. Open the `dev.ipynb` notebook from the Jupyter interface. Refer to the [basilex-notebook documentation](https://github.com/ikappaki/basilex-notebook) for more details.
+3. Open the `tutorial.ipynb` notebook from the Jupyter interface. Refer to the [basilex-notebook documentation](https://github.com/ikappaki/basilex-notebook) for more details.
 
 ***
 ### 💾 Local Basilisp Files

basilisp_kernel/__init__.py

@@ -1,5 +1,5 @@
 """The Basilisp Jupyter kernel"""
 
-__version__ = '1.2.0b1'
+__version__ = '1.2.0'
 
 from .kernel import BasilispKernel