Update: Next micro version (0.6.13).

Update: Next micro version (0.6.13).

The following are the commands that I ran to make this change.
  # find build/ level_? specifications/ documents/ licenses/ -type f -exec sed -i -e 's|0\.6\.12|0.6.13|g' '{}' ';'
  # find build/ level_? specifications/ documents/ licenses/ -type f -exec sed -i -e 's|^version_micro 12|version_micro 13|g' '{}' ';'
  # find level_3/ -name common.h -exec sed -i -e 's|_program_version_micro_s F_string_ascii_1_s F_string_ascii_2_s|_program_version_micro_s F_string_ascii_1_s F_string_ascii_3_s|g' '{}' ';'
  # find level_3/ -name common.h -exec sed -i -e 's|_program_version_micro_s_length (F_string_ascii_1_s_length + F_string_ascii_2_s_length)|_program_version_micro_s_length (F_string_ascii_1_s_length + F_string_ascii_3_s_length)|g' '{}' ';'