Merge pull request tcbrindle#12 from wrbs/patch-1

Fix typo in readme

Author: tcbrindle

readme.md

@@ -29,7 +29,7 @@ themselves by adding
 
 ```cmake
 find_package(SDL2 REQUIRED)
-find_package(SDL2_Image REQUIRED)
+find_package(SDL2_image REQUIRED)
 find_package(SDL2_ttf REQUIRED)
 
 include_directories(${SDL2_INCLUDE_DIR}