I looked this up and noticed people need to learn more things instead of just throwing a 
capo on the
neck. This song can obviously be played multiple ways, so here are a few of the shapes 
of the
progressions without a capo and with. I suggest the first way without a capo as it will 
deviate you
from playing the usual chords and this is an enjoyable and easy song to play!

Standard tuning EAGDBE
Key of A

This is standard with no capo. The entire song is played with this progression and
the strumming can easily be figured out

Bm (x24432@1)     D (xx0232@1)       A (x02220@1)       E---2--------2---------0---------0------------------------------------| (022100@1)---3--------3---------2---------0------------------------------------|
---4--------2---------2---------1------------------------------------|
---4--------0---------2---------2------------------------------------|
---2--------0---------0---------2------------------------------------|
---x------------------x---------0------------------------------------|

It can also be played with a capo on the 2nd fret if you want to use more familiar chords

(Bm)    (D)       (A)      (E)
   Am (x02210@1)     C (x32010@1)       G (320003@1)      D---0--------0---------1--------2------------------------------------| (xx0232@1)---1--------1---------1--------3------------------------------------|
---2--------0---------0--------2------------------------------------|
---2--------2---------0--------0------------------------------------|
---0--------3---------2--------0------------------------------------|
---x--------x---------3---------------------------------------------|

This is the progression for the capo on the 4th fret. This is tougher, but you will get good
practice using some different chord shapes and might make it more interesting for you to play.

(Bm)      (D)       (A)      (E)
   Gm (355333@1)     Bb (x1333x@1)      F (133211@1)      C---3--------1---------1--------0------------------------------------| (x32010@1)---3--------3---------1--------1------------------------------------|
---3--------3---------2--------0------------------------------------|
---5--------3---------3--------2------------------------------------|
---5--------1---------3--------3------------------------------------|
---3--------x---------1--------x------------------------------------|