Improvements in packaging.

The ziffers.lark file is not included in the installed package. This was
preventing users from importing the ziffers package from elsewhere.

MANIFEST.in

@@ -0,0 +1,3 @@
+include ziffers/*
+include ziffers/spec/*
+global-include *.lark

pyproject.toml

@@ -28,6 +28,21 @@ documentation = "https://github.com/Bubobubobubobubo/ziffers-python"
 repository = "https://github.com/Bubobubobubobubo/ziffers-python"
 
 [tool.black]
-line-length = 88
-target_version = ['py310']
+target_version = ['py311']
 include = '\.pyi?$'
+exclude = '''
+(
+  /(
+      \.eggs         # exclude a few common directories in the
+    | \.git          # root of the project
+    | \.hg
+    | \.mypy_cache
+    | \.tox
+    | \.venv
+    | _build
+    | buck-out
+    | build
+    | dist
+  )/
+)
+'''

ziffers/__init__.py

@@ -5,3 +5,4 @@ from .common import *
 from .defaults import *
 from .scale import *
 from .converters import *
+from .spec import *

ziffers/parser.py

@@ -6,10 +6,11 @@ from .mapper import ZiffersTransformer
 
 
 grammar_path = Path(__file__).parent
-grammar = grammar_path / "ziffers.lark"
+grammar_folder = Path.joinpath(grammar_path, "spec")
+grammar_file = Path.joinpath(grammar_folder, "ziffers.lark")
 
 ziffers_parser = Lark.open(
-    grammar,
+    str(grammar_file),
     rel_to=__file__,
     start="root",
     parser="lalr",