Improvement/update signal fault message (#129)

* Update BacktraceCrashReporter.swift

Update FaultMessage Attribute to return Termination Signal name

* Update Podfile.lock

Upgrade COCOAPODS to ver 1.15.2

Author: melekr

Podfile.lock

@@ -29,4 +29,4 @@ SPEC CHECKSUMS:
 
 PODFILE CHECKSUM: 2b7d3c7f6716bfb4ee9ab8a1ee475ca57c8165e9
 
-COCOAPODS: 1.11.3
+COCOAPODS: 1.15.2

Sources/Public/BacktraceCrashReporter.swift

@@ -1,5 +1,6 @@
 import Foundation
 import CrashReporter
+import Darwin
 
 
 /// A wrapper around `PLCrashReporter`.
@@ -34,7 +35,7 @@ extension BacktraceCrashReporter: CrashReporting {
                     return
                 }
 
-                attributesProvider.set(faultMessage: "siginfo_t.si_signo: \(signalInfo.si_signo)")
+                attributesProvider.set(faultMessage: "\(String(cString: strsignal(signalInfo.si_signo)))")
 
                 try? AttributesStorage.store(attributesProvider.dynamicAttributes, fileName: BacktraceCrashReporter.crashName)
                 try? AttachmentsStorage.store(attributesProvider.allAttachments, fileName: BacktraceCrashReporter.crashName)