0.3.12

• Add jpterm write to replace text file contents or a notebook cell's source.
• Support collaborative CLI reads and writes through a Jupyter server.

This release also releases:

• txl_cell 0.3.9
• txl_console 0.3.9
• txl_kernel 0.3.11
• txl_local_contents 0.3.9
• txl_local_kernels 0.3.9
• txl_notebook_editor 0.3.9
• txl_remote_contents 0.3.9
• txl_remote_kernels 0.3.9
• txl_widgets 0.3.9