Bump swift tools version to 5.7

Package.resolved

@@ -1,16 +1,14 @@
 {
-  "object": {
-    "pins": [
-      {
-        "package": "CLMDB",
-        "repositoryURL": "https://github.com/agisboye/CLMDB.git",
-        "state": {
-          "branch": null,
-          "revision": "3b32b6473848c139b506cc39793798a832cfb688",
-          "version": "0.9.30"
-        }
+  "pins" : [
+    {
+      "identity" : "clmdb",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/agisboye/CLMDB.git",
+      "state" : {
+        "revision" : "430cddd13460c6d134cc0dc24e52482c76ca3352",
+        "version" : "0.9.31"
       }
-    ]
-  },
-  "version": 1
+    }
+  ],
+  "version" : 2
 }

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.0
+// swift-tools-version:5.7
 
 import PackageDescription
 
@@ -9,11 +9,11 @@ let package = Package(
     ],
 
     dependencies: [
-        .package(url: "https://github.com/agisboye/CLMDB.git", .exact("0.9.31")),
+        .package(url: "https://github.com/agisboye/CLMDB.git", exact: "0.9.31")
     ],
 
     targets: [
-        .target(name: "SwiftLMDB", dependencies: ["LMDB"], path: "Sources"),
+        .target(name: "SwiftLMDB", dependencies: [.product(name: "LMDB", package: "CLMDB")], path: "Sources"),
         .testTarget(name: "SwiftLMDBTests", dependencies: ["SwiftLMDB"]),
     ]
 )

README.md

@@ -19,7 +19,7 @@ SwiftLMDB has been tested on iOS and macOS, however it should also run on Linux.
 ## Requirements
 
 - iOS 8.0+ or macOS 10.10+
-- Swift 5.0+
+- Swift 5.7+
 
 
 ## Installation