Publicise memory logger cache

Author: jnewc

Sources/Cosmic/Base/LogCache.swift

@@ -21,7 +21,7 @@ struct LogCacheEntry {
 }
 
 
-class LogCache {
+public class LogCache {
 
     fileprivate var entries: [LogCacheEntry] = []
 

Sources/Cosmic/Loggers/MemoryLogger.swift

@@ -18,7 +18,7 @@ public class MemoryLogger: Logger {
 
     public var formatters: [LogFormatter] = []
 
-    internal(set) var cache: LogCache = LogCache()
+    public internal(set) var cache: LogCache = LogCache()
 
     public required init() { }