Loosen data structure library dependency specifications (#806)

Fixes #805

Author: chrisrink10

CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  * Improve the Python generation for `do`, `if`, `let*`, and `letfn*` forms to avoid unnecessary extra assignments (#793, #794, #799)
  * Generate Python classes for `deftype*` and `reify*` forms using modern `@attr.define`, `@attr.frozen`, and `@attr.field` APIs (#799)
  * Generate Protocol functions with nicer names based on the protocol function and dispatch type (#803)
+ * Loosen the dependency specification for Immutables and Pyrsistent to allow for a wider version range (#805)
 
 ### Fixed
  * Fix issue with `(count nil)` throwing an exception (#759)

pyproject.toml

@@ -32,9 +32,9 @@ include = ["README.md", "LICENSE"]
 [tool.poetry.dependencies]
 python = "^3.8"
 attrs = ">=20.1.0"
-immutables = "^0.20"
+immutables = ">=0.20,<1.0.0"
 prompt-toolkit = "^3.0.0"
-pyrsistent = "^0.18.0"
+pyrsistent = ">=0.18.0,<1.0.0"
 python-dateutil = "^2.8.1"
 readerwriterlock = "^1.0.8"
 typing_extensions = "^4.9.0"