update contributors list (#43)

motivation: keep contributors list up to date

changes:
* add mailmap
* run contributors script

Author: tomerd

.mailmap

@@ -0,0 +1,3 @@
+Tomer Doron <tomer@apple.com> <tomer@apple.com>
+Tomer Doron <tomer@apple.com> <tomerd@apple.com>
+Tomer Doron <tomer@apple.com> <tomer.doron@gmail.com>

CONTRIBUTORS.txt

@@ -11,7 +11,11 @@ needs to be listed here.
 
 ### Contributors
 
-- tomer doron <tomerd@apple.com>
+- Fabian Fett <fabianfett@mac.com>
+- George Barnett <gbarnett@apple.com>
+- Johannes Weiss <johannesweiss@apple.com>
+- Norman Maurer <norman_maurer@apple.com>
+- Tomer Doron <tomer@apple.com>
 
 **Updating this list**
 

scripts/generate_contributors_list.sh

@@ -19,7 +19,7 @@ contributors=$( cd "$here"/.. && git shortlog -es | cut -f2 | sed 's/^/- /' )
 
 cat > "$here/../CONTRIBUTORS.txt" <<- EOF
 	For the purpose of tracking copyright, this is the list of individuals and
-	organizations who have contributed source code to AWSLambdaRuntime.
+	organizations who have contributed source code to SwiftAWSLambdaRuntime.
 
 	For employees of an organization/company where the copyright of work done
 	by employees of that company is held by the company itself, only the company