releaser: Bump versions for release of 0.90.1

[ci skip]

Author: bep

common/hugo/version_current.go

@@ -16,7 +16,7 @@ package hugo
 // CurrentVersion represents the current build version.
 // This should be the only one.
 var CurrentVersion = Version{
-	Number:     0.91,
-	PatchLevel: 0,
-	Suffix:     "-DEV",
+	Number:     0.90,
+	PatchLevel: 1,
+	Suffix:     "",
 }

snap/snapcraft.yaml

@@ -8,7 +8,7 @@ description: |
 license: "Apache-2.0"
 base: core20
 confinement: strict
-grade: devel # "devel" or "stable"
+grade: stable # "devel" or "stable"
 
 package-repositories:
   - type: apt