Submitting two new Mac techniques

- Clear Command History
- Gatekeeper Bypass

Mac/Defense_Evasion/Clear_Command_History.md

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+# Defense Evasion
+
+MITRE ATT&CK Technique: [T1146](https://attack.mitre.org/wiki/Technique/T1146)
+
+
+## multiple shells
+
+    unset HISTFILE
+
+    export HISTFILESIZE=0
+
+    history -c
+
+## bash
+
+    rm ~/.bash_history
+
+	cat /dev/null > ~/.bash_history
+
+	

Mac/Defense_Evasion/Gatekeeper_Bypass.md

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+# Defense Evasion
+
+MITRE ATT&CK Technique: [T1144](https://attack.mitre.org/wiki/Technique/T1144)
+
+
+    sudo xattr -r -d com.apple.quarantine /path/to/MyApp.app
+
+    sudo spctl --master-disable
+