Use head commit

Author: jberkel

Tests/Carthage/Makefile

@@ -5,14 +5,12 @@ CARTHAGE_DIR := Carthage
 CARTHAGE_ARGS := --no-use-binaries
 CARTHAGE_TOOLCHAIN := com.apple.dt.toolchain.Swift_3_0
 CARTHAGE_CMDLINE := --configuration $(CARTHAGE_CONFIGURATION) --platform $(CARTHAGE_PLATFORM) --toolchain $(CARTHAGE_TOOLCHAIN) $(CARTHAGE_ARGS)
-TRAVIS_COMMIT ?= master
-TRAVIS_BUILD_DIR ?= https://github.com/stephencelis/SQLite.swift.git
 
 test: $(CARTHAGE) Cartfile
 	$< bootstrap $(CARTHAGE_CMDLINE)
 
 Cartfile:
-	echo 'git "$(TRAVIS_BUILD_DIR)" "$(TRAVIS_COMMIT)"' > $@
+	echo 'git "$(TRAVIS_BUILD_DIR)" "HEAD"' > $@
 
 clean:
 	@rm -f Cartfile Cartfile.resolved