🏗️ Migrate from nyc to c8

Signed-off-by: kei-g <km.8k6ce+github@gmail.com>

Author: kei-g

.nycrc.json renamed to .c8rc.json

@@ -11,7 +11,7 @@
   ],
   "functions": 100,
   "include": [
-    "**/*.ts"
+    "src/**/*.ts"
   ],
   "lines": 100,
   "reporter": [
@@ -20,9 +20,21 @@
   ],
   "statements": 100,
   "watermarks": {
-    "branches": [80, 95],
-    "functions": [80, 95],
-    "lines": [80, 95],
-    "statements": [80, 95]
+    "branches": [
+      80,
+      95
+    ],
+    "functions": [
+      80,
+      95
+    ],
+    "lines": [
+      80,
+      95
+    ],
+    "statements": [
+      80,
+      95
+    ]
   }
 }