Divide capacitors value by a 2 factor (choosing 630V at least) and double the resistor value (3W or more ) BUT .... this time the BIG challenge is the fact that the operating voltage of the relay being equivalent to the power (115vac), it should be replaced by a 220V. It's a costly option meaning at least 25% of the overall module price for purchasing  the "fitting well" relay. 

For all modifications, take care of the fact that you are working on "line voltage 120V/220V". 
Don't try to plug your work until you closed the box and screwed it. 

This page is for information only, all the modifications that you perform on the original module are AT YOUR OWN RISKS.

• Unsolder the two large brown capactitors at the top right side labelled C1(1.5K) & C4(0.22K).

Be carefull while unsoldering. Two sides PCB are really fragile.

• Remove the original grey relay (Goodsky).
  
• Remove the original 130V MOV (disk at the top of the relay)
  
• Remove the 3W resistor 27 ohm (between C1 & C4).

1 x 680 nF 630V fit in C1
1 x 100 nF 630V fit in C4
1 x 68 ohm 3W fit in R1
1 x 240V MOV (also named varistor)
1 x relay coil 230V, contact 16A 250V

Solder them at their respective places

Result should look like picture at left