some joint is wrong

[ersaijun]

some joint limit should be reversed.

<joint
    name="left_inner_finger_joint"
    type="revolute">
    <origin
      xyz="0.034585310861294 0 0.0454970193817975"
      rpy="0 0 0" />
    <parent
      link="left_inner_knuckle" />
    <child
      link="left_inner_finger" />
    <axis
      xyz="0 -1 0" />
    <limit
      **lower="-0.8757"
      upper="0"**
      velocity="2.0"
      effort="1000" />
    <mimic 
      joint="finger_joint"
      multiplier="-1"
      offset="0" />
  </joint>

<joint
    name="right_inner_knuckle_joint"
    type="revolute">
    <origin
      xyz="-0.0126999999998499 0 0.0693075000000361"
      rpy="0 0 3.14159265358979" />
    <parent
      link="robotiq_85_base_link" />
    <child
      link="right_inner_knuckle" />
    <axis
      xyz="0 1 0" />
    **<limit
      lower="-0.8757"
      upper="0"**
      velocity="2.0"
      effort="1000" />
    <mimic 
      joint="finger_joint"
      multiplier="-1"
      offset="0" />
  </joint>

<joint
    name="right_outer_knuckle_joint"
    type="revolute">
    <origin
      xyz="-0.0306011444258893 0 0.0627920162695395"
      rpy="0 0 3.14159265358979" />
    <parent
      link="robotiq_85_base_link" />
    <child
      link="right_outer_knuckle" />
    <axis
      xyz="0 1 0" />
    <limit
      **lower="-0.8757"
      upper="0"**
      velocity="2.0"
      effort="1000" />
    <mimic 
      joint="finger_joint"
      multiplier="-1"
      offset="0" />
  </joint>