Change default download specification to PMHC 4.0

This matches the default in the PMHC web interface.
Bumped package version as this is a breaking change if you use the
default values.

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pmhclib"
-version = "0.3.0"
+version = "0.4.0"
 description = "Python wrapper for unofficial PMHC MDS portal API"
 authors = [
     "David Wales <david.wales@swsphn.com.au>",

src/pmhclib/pmhc.py

@@ -325,7 +325,7 @@ def download_pmhc_mds(
         start_date: date = date.today() - timedelta(days=30),
         end_date: date = date.today(),
         organisation_path: Optional[str] = None,
-        specification: PMHCSpecification = PMHCSpecification.ALL,
+        specification: PMHCSpecification = PMHCSpecification.PMHC,
         without_associated_dates: bool = True,
         matched_episodes: bool = True,
     ) -> Path:
@@ -340,8 +340,8 @@ def download_pmhc_mds(
             organisation_path: PHN identifier (default: inherited
                 from parent class.)
             specification: Specification for extract. (default:
-                `PMHCSpecification.ALL`, which returns data from all
-                specifications.)
+                `PMHCSpecification.PMHC`, which returns data from the
+                PMHC 4.0 specification.)
             without_associated_dates: Enable extract option
                 "Include data without associated dates"
             matched_episodes: Enable extract option