chore: update nvm versions to the latest version of Node supported

sghoweri · sghoweri · commit 77411c1d9d7b · 2019-11-14T09:02:09.000-05:00
diff --git a/.nvmrc b/.nvmrc
@@ -1 +1 @@
-12.9.0
+12.12.0
diff --git a/packages/development-edition-engine-handlebars/.nvmrc b/packages/development-edition-engine-handlebars/.nvmrc
@@ -1 +1 @@
-10.0.0
+12.12.0
diff --git a/packages/uikit-workshop/.nvmrc b/packages/uikit-workshop/.nvmrc
@@ -1 +1 @@
-10.0.0
+12.12.0
