Update README.md

README.md

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 # SPIFFS (SPI Flash File System) 
-**V0.3.3**
+**V0.3.4**
 
 Copyright (c) 2013-2016 Peter Andersson (pelleplutt1976 at gmail.com)
 
@@ -49,6 +49,29 @@ For a generic spi flash driver, see [this](https://github.com/pellepl/spiflash_d
 
 ## HISTORY
 
+### 0.3.4
+- Added user callback file func.
+- Fixed a stat bug with obj id.
+- SPIFFS_probe_fs added
+- Add possibility to compile a read-only version of spiffs
+- Make magic dependent on fs length, if needed (see #59 & #66) (thanks @hreintke)
+- Exposed SPIFFS_open_by_page_function
+- Zero-size file cannot be seek #57 (thanks @lishen2)
+- Add tell and eof functions #54 (thanks @raburton)
+- Make api string params const #53 (thanks @raburton)
+- Preserve user_data during mount() #51 (thanks @rojer)
+
+New API functions:
+- `SPIFFS_set_file_callback_func` - register a callback informing about file events
+- `SPIFFS_probe_fs` - probe a spi flash trying to figure out size of fs
+- `SPIFFS_open_by_page` - open a file by page index
+- `SPIFFS_eof` - checks if end of file is reached
+- `SPIFFS_tell` - returns current file offset
+
+New config defines:
+- `SPIFFS_READ_ONLY`
+- `SPIFFS_USE_MAGIC_LENGTH`
+
 ### 0.3.3
 **Might not be compatible with 0.3.2 structures. See issue #40**
 - Possibility to add integer offset to file handles