actions: Integrate with bors

Author: kpcyrd

.github/bors.toml

@@ -0,0 +1,8 @@
+status = [
+    "test (ubuntu-latest, stable)",
+    "test (macos-latest, stable)",
+    "test (windows-latest, stable)",
+    "rustfmt",
+    "clippy",
+]
+delete_merged_branches = true

.github/workflows/default.yml

@@ -7,7 +7,8 @@ on:
     branches: [ master ]
 
 jobs:
-  build:
+  test:
+    name: test
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -35,7 +36,7 @@ jobs:
       run: cargo doc
 
   fmt:
-    name: Rustfmt
+    name: rustfmt
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -53,7 +54,7 @@ jobs:
           args: --all -- --check
 
   clippy:
-    name: Clippy
+    name: clippy
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2