[PythonKit] Removed PythonTool target and external dependency

Author: pvieito

Package.swift

@@ -5,25 +5,12 @@ import PackageDescription
 let package = Package(
     name: "PythonKit",
     products: [
-        .executable(
-            name: "PythonTool",
-            targets: ["PythonTool"]
-        ),
         .library(
             name: "PythonKit",
             targets: ["PythonKit"]
         )
     ],
-    dependencies: [
-        .package(url: "https://github.com/pvieito/LoggerKit.git", .branch("master")),
-        .package(url: "https://github.com/apple/swift-argument-parser", .branch("main")),
-    ],
     targets: [
-        .target(
-            name: "PythonTool",
-            dependencies: ["LoggerKit", "PythonKit", .product(name: "ArgumentParser", package: "swift-argument-parser")],
-            path: "PythonTool"
-        ),
         .target(
             name: "PythonKit",
             path: "PythonKit"

PythonTool/Info.plist

@@ -38,38 +38,25 @@ Add the following dependency to your `Package.swift` manifest:
 .package(url: "https://github.com/pvieito/PythonKit.git", .branch("master")),
 ```
 
-## Build & Run
+## Environment Variables
 
-`PythonKit` can be built with Swift PM:
-
-```
-$ cd PythonKit
-$ swift run
-[*] Python 3.7
-[ ] Version: 3.7.0
-```
-
-The Python library will be loaded at runtime, `PythonKit` will try to find the most modern Python version available in the system. You can force a given version with the `PYTHON_VERSION` environment variable or an specific Python library path or name with `PYTHON_LIBRARY`.
+As the Python library are loaded at runtime by `PythonKit`, it will try to find the most modern Python version available in the system. You can force a given version with the `PYTHON_VERSION` environment variable or an specific Python library path or name with `PYTHON_LIBRARY`.
 
 ```
 $ PYTHON_VERSION=3 swift run
 [*] Python 3.5
-[ ] Version: 3.5.2
 $ PYTHON_VERSION=2.7 swift run
 [*] Python 2.7
-[ ] Version: 2.7.10
 $ PYTHON_LIBRARY=libpython3.5.so swift run
 [*] Python 3.5
-[ ] Version: 3.5.2
 $ PYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython2.7.so swift run
 [*] Python 2.7
-[ ] Version: 2.7.10
 ```
 
 If `PythonKit` cannot find and load the Python library you can set the `PYTHON_LOADER_LOGGING` environment variable to know from which locations `PythonKit` is trying to load the library:
 
 ```
-$ PYTHON_LOADER_LOGGING=TRUE PYTHON_VERSION=3.8 PythonTool
+$ PYTHON_LOADER_LOGGING=TRUE PYTHON_VERSION=3.8 swift run
 Loading symbol 'Py_Initialize' from the Python library...
 Trying to load library at 'Python.framework/Versions/3.8/Python'...
 Trying to load library at '/usr/local/Frameworks/Python.framework/Versions/3.8/Python'...