updated docs on logger and updated dependencies for logging. (#3)

Author: dastrobu

Package.resolved

@@ -6,17 +6,17 @@
         "repositoryURL": "https://github.com/IBM-Swift/HeliumLogger.git",
         "state": {
           "branch": null,
-          "revision": "2afeb4c02f5a48a7fbd081fe8607b91eeebd7ecb",
-          "version": "1.7.1"
+          "revision": "5ad546a39376b911a6cd4b06e8cadf60aa9e9472",
+          "version": "1.8.0"
         }
       },
       {
         "package": "LoggerAPI",
         "repositoryURL": "https://github.com/IBM-Swift/LoggerAPI.git",
         "state": {
           "branch": null,
-          "revision": "5041f2673aa75d6e973d9b6bd3956bc5068387c8",
-          "version": "1.7.3"
+          "revision": "d0ccb4158b83f8692531892a9c894bb757593c6f",
+          "version": "1.8.0"
         }
       }
     ]

Package.swift

@@ -12,8 +12,8 @@ let package = Package(
             ]),
     ],
     dependencies: [
-        .package(url: "https://github.com/IBM-Swift/LoggerAPI.git", from: "1.7.0"),
-        .package(url: "https://github.com/IBM-Swift/HeliumLogger.git", from: "1.7.0")
+        .package(url: "https://github.com/IBM-Swift/LoggerAPI.git", from: "1.8.0"),
+        .package(url: "https://github.com/IBM-Swift/HeliumLogger.git", from: "1.8.0")
     ],
     targets: [
         .target(

README.md

@@ -533,7 +533,7 @@ To activate logging, one must configure a logger. A simple logger is e.g.
 ```swift
 import LoggerAPI
 import HeliumLogger
-Log.log = HeliumLogger(.debug)
+Log.logger = HeliumLogger(.debug)
 
 let argTree = ArgTree()
 try! argtree.parse()