CompatHelper: bump compat for "Missings" to "1.0" (#684)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Phillip Alday <[email protected]>

Author: github-actions[bot]

Project.toml

@@ -17,7 +17,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 [compat]
 DataAPI = "1"
 DataStructures = "0.10, 0.11, 0.12, 0.13, 0.14, 0.17, 0.18"
-Missings = "0.3, 0.4"
+Missings = "0.3, 0.4, 1.0"
 SortingAlgorithms = "0.3"
 julia = "1"