move batpmu widget to match new layout

contrib/README.md

@@ -54,8 +54,7 @@ Supported platforms: Linux (required tools: `sysfs`)
     {dpm_perf_level}, {profile}, {engine_clock mhz}, {engine_clock khz},
     {memory_clock mhz}, {memory_clock khz}, {voltage v}, {voltage mv}
 
-vicious.contrib.batpmu
-  -
+**vicious.contrib.batpmu**
 
 vicious.contrib.batproc
   -

contrib/batpmu_linux.lua

@@ -21,7 +21,7 @@ local string = {
 
 -- Batpmu: provides state, charge and remaining time for a requested battery using PMU
 -- vicious.contrib.batpmu
-local batpmu = {}
+local batpmu_linux = {}
 
 
 -- {{{ Battery widget type
@@ -76,4 +76,4 @@ local function worker(format, batid)
 end
 -- }}}
 
-return setmetatable(batpmu, { __call = function(_, ...) return worker(...) end })
+return setmetatable(batpmu_linux, { __call = function(_, ...) return worker(...) end })