Add Makefile target and reqs for examples

CHANGELOG.md

@@ -8,6 +8,10 @@ All notable changes to this project will be documented in this file. The format
 
 - Fix bug when calling `PageImage.debug_tablefinder()` (i.e., with no parameters). ([#659](https://github.com/jsvine/pdfplumber/issues/659)) [h/t @rneumann7]
 
+### Development Changes
+
+- Add `Makefile` target for `examples`, as well as dev requirements to support re-running the example notebooks automatically.
+
 ## [0.7.0] - 2022-05-27
 
 ### Added

Makefile

@@ -1,4 +1,4 @@
-.PHONY: venv tests check-black check-flake lint format
+.PHONY: venv tests check-black check-flake lint format examples
 PYTHON := venv/bin/python
 PIP = venv/bin/pip
 
@@ -30,3 +30,6 @@ lint: check-flake check-mypy check-black check-isort
 format:
 	${PYTHON} -m black pdfplumber tests
 	${PYTHON} -m isort --profile black pdfplumber tests
+
+examples:
+	${PYTHON} -m nbexec.cli examples/notebooks

requirements-dev.txt

@@ -8,3 +8,5 @@ pandas==1.3.5
 mypy==0.942
 pandas-stubs==1.2.0.58
 types-Pillow==9.0.14
+jupyterlab==3.4.2
+nbexec==0.1.0