1.1.0

• Add a function cJSON_PrintPreallocated to print to a preallocated buffer, thanks @ChisholmKyle (#72)
• More compiler warnings when using Clang or GCC, thanks @gatzka (#75, #78)
• fixed a memory leak in cJSON_Duplicate, thanks @alperakcan (#81)
• fix the ENABLE_CUSTOM_COMPILER_FLAGS cmake option