Revert "QC: Check for only one decimal place."

This reverts commit c213b0010c3ddc8d3215adab65bd489a9b884e30.

After a larger discussion with Arthur, Rob and Pjotr present, it was
verified that the strict checks are important. This reverts the commit
that allowed for looser checks.

1 files changed, 3 insertions, 3 deletions

diff --git a/quality_control/average.py b/quality_control/average.py
index 95b6c4a..ad732d0 100644
--- a/quality_control/average.py
+++ b/quality_control/average.py
@@ -9,8 +9,8 @@ def invalid_value(line_number: int, column_number: int, val: str) -> Union[
     """Return an `InvalidValue` object if `val` is not a valid "averages"
     value."""
     return cell_error(
-        r"^[0-9]+\.[0-9]{1,}$", val, line=line_number,
+        r"^([0-9]+\.[0-9]{3}|[0-9]+\.?0*)$", val, line=line_number,
         column=column_number, value=val, message=(
             f"Invalid value '{val}'. "
-            "Expected string representing a number with at least one decimal "
-            "place."))
+            "Expected string representing a number with exactly three "
+            "decimal places."))