Update build backend (#84)

Author: regen100

.gitignore

@@ -1,3 +1,5 @@
+cmake_language_server/version.py
+
 /build/
 /dist/
 __pycache__/
@@ -7,5 +9,5 @@ __pycache__/
 .coverage
 coverage.xml
 
-.pdm.toml
+.pdm-python
 __pypackages__/

cmake_language_server/version.py

@@ -27,13 +27,13 @@ repository = "https://github.com/regen100/cmake-language-server"
 cmake-language-server = "cmake_language_server.server:main"
 
 [build-system]
-requires = ["pdm-pep517>=1.0.0"]
-build-backend = "pdm.pep517.api"
+requires = ["pdm-backend"]
+build-backend = "pdm.backend"
 
 [tool.pdm.version]
 source = "scm"
 write_to = "cmake_language_server/version.py"
-write_template = "__version__ = '{}'"
+write_template = "__version__ = \"{}\"\n"
 
 [tool.pdm.dev-dependencies]
 dev = [