Remove obsolete logger field mentions from docs (#836)

Version logger field was removed in #623 but some places were missed.

docs/api.md

@@ -111,9 +111,9 @@ const logger = pino({
   }
 })
 logger.info('hello')
-// {"level":30,"time":1573664685466,"pid":78742,"hostname":"x","line":1,"msg":"hello","v":1}
+// {"level":30,"time":1573664685466,"pid":78742,"hostname":"x","line":1,"msg":"hello"}
 logger.info('world')
-// {"level":30,"time":1573664685469,"pid":78742,"hostname":"x","line":2,"msg":"world","v":1}
+// {"level":30,"time":1573664685469,"pid":78742,"hostname":"x","line":2,"msg":"world"}
 ```
 
 #### `redact` (Array | Object):
@@ -285,7 +285,7 @@ The string key for the 'message' in the JSON object.
 
 Default: `null`
 
-If there's a chance that objects being logged have properties that conflict with those from pino itself (`level`, `timestamp`, `v`, `pid`, etc)
+If there's a chance that objects being logged have properties that conflict with those from pino itself (`level`, `timestamp`, `pid`, etc)
 and duplicate keys in your log records are undesirable, pino can be configured with a `nestedKey` option that causes any `object`s that are logged
 to be placed under a key whose name is the value of `nestedKey`.
 
@@ -301,7 +301,7 @@ const thing = { level: 'hi', time: 'never', foo: 'bar'} // has pino-conflicting
 logger.info(thing)
 
 // logs the following:
-// {"level":30,"time":1578357790020,"pid":91736,"hostname":"x","payload":{"level":"hi","time":"never","foo":"bar"},"v":1}
+// {"level":30,"time":1578357790020,"pid":91736,"hostname":"x","payload":{"level":"hi","time":"never","foo":"bar"}}
 ```
 In this way, logged objects' properties don't conflict with pino's standard logging properties,
 and searching for logged objects can start from a consistent path.

docs/pretty.md

@@ -33,9 +33,8 @@ module.exports = function myPrettifier (options) {
   return function prettifier (inputData) {
     let logObject
     if (typeof inputData === 'string') {
-      const parsedData = someJsonParser(inputData)
-      logObject = (isPinoLog(parsedData)) ? parsedData : undefined
-    } else if (isObject(inputData) && isPinoLog(inputData)) {
+      logObject = someJsonParser(inputData)
+    } else if (isObject(inputData)) {
       logObject = inputData
     }
     if (!logObject) return inputData
@@ -45,10 +44,6 @@ module.exports = function myPrettifier (options) {
   function isObject (input) {
     return Object.prototype.toString.apply(input) === '[object Object]'
   }
-
-  function isPinoLog (log) {
-    return log && (log.hasOwnProperty('v') && log.v === 1)
-  }
 }
 ```