reorder constant location to match sequential values of existing constants

Author: bhamail

libgit2-sys/lib.rs

@@ -1102,6 +1102,7 @@ pub const GIT_DIFF_ENABLE_FAST_UNTRACKED_DIRS: git_diff_option_t = 1 << 14;
 pub const GIT_DIFF_UPDATE_INDEX: git_diff_option_t = 1 << 15;
 pub const GIT_DIFF_INCLUDE_UNREADABLE: git_diff_option_t = 1 << 16;
 pub const GIT_DIFF_INCLUDE_UNREADABLE_AS_UNTRACKED: git_diff_option_t = 1 << 17;
+pub const GIT_DIFF_INDENT_HEURISTIC: git_diff_option_t = 1 << 18;
 pub const GIT_DIFF_FORCE_TEXT: git_diff_option_t = 1 << 20;
 pub const GIT_DIFF_FORCE_BINARY: git_diff_option_t = 1 << 21;
 pub const GIT_DIFF_IGNORE_WHITESPACE: git_diff_option_t = 1 << 22;
@@ -1112,7 +1113,6 @@ pub const GIT_DIFF_SHOW_UNMODIFIED: git_diff_option_t = 1 << 26;
 pub const GIT_DIFF_PATIENCE: git_diff_option_t = 1 << 28;
 pub const GIT_DIFF_MINIMAL: git_diff_option_t = 1 << 29;
 pub const GIT_DIFF_SHOW_BINARY: git_diff_option_t = 1 << 30;
-pub const GIT_DIFF_INDENT_HEURISTIC: git_diff_option_t = 1 << 18;
 
 #[repr(C)]
 pub struct git_diff_find_options {