Merge pull request #2 from Alhadis/fix-makefile

Fix `make install` command.

Makefile

@@ -2,7 +2,7 @@ SRC    = harvester.js
 TARGET = bookmarklet.js
 
 all: install lint $(TARGET)
-	
+
 
 # Compile/minify bookmarklet
 $(TARGET): $(SRC)
@@ -20,8 +20,8 @@ lint:
 
 # Install required dependencies
 install:
-	@(command -v uglifyjs 2>&1 >/dev/null) || npm -g uglify-es
-	@(command -v eslint   2>&1 >/dev/null) || npm -g eslint
+	@(command -v uglifyjs 2>&1 >/dev/null) || npm install -g uglify-es
+	@(command -v eslint   2>&1 >/dev/null) || npm install -g eslint
 
 
 # Delete generated files