update gh actions and renovate config

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

.github/renovate.json

@@ -0,0 +1,19 @@
+{
+  "extends": [
+    "config:base"
+  ],
+  "packageRules": [
+    {
+      "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
+      "automerge": true
+    },
+    {
+      "groupName": "all deps",
+      "separateMajorMinor": true,
+      "groupSlug": "all",
+      "packagePatterns": [
+        "*"
+      ]
+    }
+  ]
+}

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
     - name: setup
       uses: actions/setup-go@v2
       with:
-        go-version: 1.15
+        go-version: 1.16
     - name: checkout
       uses: actions/checkout@v2
     - name: cache

.github/workflows/pr.yml

@@ -11,7 +11,7 @@ jobs:
     - name: setup
       uses: actions/setup-go@v2
       with:
-        go-version: 1.15
+        go-version: 1.16
     - name: checkout
       uses: actions/checkout@v2
     - name: cache