Set version to '1.2.6'

Author: nfbot

source/version.json

@@ -1,13 +1,13 @@
 {
   "$schema": "https://raw.githubusercontent.com/AArnott/Nerdbank.GitVersioning/master/src/NerdBank.GitVersioning/version.schema.json",
-  "version": "1.2.6-preview.{height}",
+  "version": "1.2.6",
   "assemblyVersion": {
     "precision": "revision"
   },
   "semVer1NumericIdentifierPadding": 3,
-  "nugetPackageVersion": {
-    "semVer": 2
-   },
+  "nuGetPackageVersion": {
+    "semVer": 2.0
+  },
   "publicReleaseRefSpec": [
     "^refs/heads/master$",
     "^refs/heads/v\\d+(?:\\.\\d+)?$"
@@ -20,4 +20,4 @@
     "branchName": "release-v{version}",
     "firstUnstableTag": "preview"
   }
-}
+}