Fix trailing semicolons for some Makefile commands

Makefile

@@ -6,7 +6,7 @@ PHPUNIT_ARGS=--process-isolation
 composer:
 	@command -v composer >/dev/null 2>&1; \
 	if test $$? -eq 0; then \
-		composer $(COMPOSER_ARGS) ;\
+		composer $(COMPOSER_ARGS); \
 	elif test -r composer.phar; then \
 		php composer.phar $(COMPOSER_ARGS); \
 	else \
@@ -18,7 +18,7 @@ composer:
 test: composer
 	@command -v phpunit >/dev/null 2>&1; \
 	if test $$? -eq 0; then \
-		phpunit $(PHPUNIT_ARGS) ;\
+		phpunit $(PHPUNIT_ARGS); \
 	elif test -r phpunit.phar; then \
 		php phpunit.phar $(PHPUNIT_ARGS); \
 	else \
@@ -30,9 +30,9 @@ test: composer
 apigen:
 	@command -v apigen >/dev/null 2>&1; \
 	if test $$? -eq 0; then \
-		apigen generate
+		apigen generate; \
 	elif test -r apigen.phar; then \
-		php apigen.phar generate \
+		php apigen.phar generate; \
 	else \
 		echo "Cannot find apigen :("; \
 		echo "Aborting."; \
@@ -42,7 +42,7 @@ apigen:
 mkdocs:
 	@command -v mkdocs >/dev/null 2>&1; \
 	if test $$? -eq 0; then \
-		mkdocs build --clean \
+		mkdocs build --clean; \
 	else \
 		echo "Cannot find mkdocs :("; \
 		echo "Aborting."; \