Updates bare minimum initseq to 2000 us

- Previous value was 4000 us (4000 microseconds). This was too short to
  identify certain RCSwitch protocols (like protocol 7).

- Also a few minor updates in README and example code

README.md

@@ -132,3 +132,37 @@ This is the goal of
 
 You can copy-paste the output of `01_main.ino` to call RF433recv library.
 
+
+About 'false positives'
+-----------------------
+
+Since RF433any is struggling to identify a coding sequence from any kind of
+signal, it is prone to identifying codes from what is noise.
+
+There are two ways to mitigate it:
+
+- Use get_nb_bits() (see example `01_main.ino`) and ignore any signal below a
+certain threshold. Note RF433any has a hard-coded limit of 7 bits of coding.
+
+- Use strictness of signal analyzis. That is, when creating the Track object,
+use the second parameter.
+
+Default Track construction:
+
+```c++
+    Track track(PIN_RFINPUT);
+```
+
+This is equivalent to:
+
+```c++
+    Track track(PIN_RFINPUT, RAIL_MOOD_LAXIST);
+```
+
+If you are tired of fake receptions of actually non-coding signal, you can
+instead execute:
+
+```c++
+    Track track(PIN_RFINPUT, RAIL_MOOD_STRICT);
+```
+

RF433any.h

@@ -576,7 +576,7 @@ class DecoderManchester: public Decoder {
 // * Track ********************************************************************
 // * ***** ********************************************************************
 
-#define TRACK_MIN_INITSEQ_DURATION 4000
+#define TRACK_MIN_INITSEQ_DURATION 2000
 #define TRACK_MIN_BITS             7
 
     // IMPORTANT

examples/03_output-signal-timings/03_output-signal-timings.ino

@@ -75,7 +75,7 @@ void setup() {
     free(buf);
 }
 
-Track track(PIN_RFINPUT);
+Track track(PIN_RFINPUT, RAIL_MOOD_STRICT);
 
 void output_timings(Decoder *pdec) {
     TimingsExt tsext;